Photo: Gregdonohoe (talk) (CC BY-SA 3.0) — via Wikimedia Commons
Cupid Cichlid (Biotodoma cupido)
A jewel-flanked South American dwarf cichlid with a striking eyespot and a surprisingly peaceable personality for the genus.
Will it live with a Cupid Cichlid?
We compare each fish against your cupid cichlid on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Agassiz's Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Agassiz's Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Banjo Catfish✅ CompatiblePeaceful · 15 cm · Medium care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
- Bearded Corydoras✅ CompatiblePeaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
- Compatible on the things that matter: shared water near 24–24 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Bearded Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Black Kuhli Loach✅ CompatiblePeaceful · 8 cm · Easy care · 23–28 °C (73–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Bolivian Ram✅ CompatiblePeaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Bristlenose Pleco✅ CompatiblePeaceful · 12 cm · Easy care · 23–30 °C (73–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–29 °C — no size, zone or temperament conflicts.
- Burmese Loach✅ CompatiblePeaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Clown Pleco✅ CompatiblePeaceful · 9 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Corydoras Catfish✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
- Giant Kuhli Loach✅ CompatiblePeaceful · 12 cm · Easy care · 24–30 °C (75–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Kuhli Loach✅ CompatiblePeaceful · 10 cm · Easy care · 24–30 °C (75–86 °F)
- Compatible on the things that matter: shared water near 24–29 °C, workable temperaments, and no predator-and-prey size gap.
- Leopard Frog Pleco✅ CompatiblePeaceful · 9 cm · Medium care · 25–30 °C (77–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Marbled Hoplo✅ CompatiblePeaceful · 14 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Pantanal Corydoras✅ CompatiblePeaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Pantanal Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Peppered Corydoras✅ CompatiblePeaceful · 7 cm · Easy care · 18–26 °C (64–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Peppered Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Porthole Catfish✅ CompatiblePeaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Rio Negro Checkerboard Cichlid✅ CompatiblePeaceful · 7 cm · Hard care · 24–29 °C (75–84 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–29 °C — no size, zone or temperament conflicts.
- Spotfin Corydoras✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Spotfin Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotted Corydoras✅ CompatiblePeaceful · 7 cm · Easy care · 22–27 °C (72–81 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Keep Spotted Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotted Rubbernose Pleco✅ CompatiblePeaceful · 12 cm · Medium care · 20–26 °C (68–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
- Spotted Talking Catfish✅ CompatiblePeaceful · 15 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
- Sterbai Corydoras✅ CompatiblePeaceful · 6.5 cm · Medium care · 24–30 °C (75–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–29 °C — no size, zone or temperament conflicts.
- Keep Sterbai Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Striped Eel Loach✅ CompatiblePeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Zebra Pleco✅ CompatiblePeaceful · 10 cm · Hard care · 26–30 °C (79–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Banded Gourami⚠️ With cautionSemi-aggressive · 12 cm · Easy care · 22–28 °C (72–82 °F)
- Cupid Cichlid and Banded Gourami can both be territorial; doable with space and dense planting, but watch for chasing.
- Blue Gourami⚠️ With cautionSemi-aggressive · 13 cm · Easy care · 22–28 °C (72–82 °F)
- Cupid Cichlid and Blue Gourami can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~113 L this pairing really wants — crowding raises aggression.
- Boesemani Rainbowfish⚠️ With cautionPeaceful · 11 cm · Medium care · 24–28 °C (75–82 °F)
- Different pH ranges (5–7 vs 7.5–8.5); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Cupid Cichlid 1–8 vs Boesemani Rainbowfish 10–20 dGH).
- Cupid Cichlid and Boesemani Rainbowfish are close in size, but the semi-aggressive one tends to dominate — add boesemani rainbowfish in a group to spread the pressure.
- Your 110 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
- Keep Boesemani Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Calvus Cichlid⚠️ With cautionSemi-aggressive · 14 cm · Medium care · 24–27 °C (75–81 °F)
- pH preferences only just meet (Cupid Cichlid 5–7 vs Calvus Cichlid 7.8–9) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (1–8 vs 10–20 dGH) — a compromise, not a perfect match.
- Cupid Cichlid and Calvus Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Giant Betta⚠️ With cautionPeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Cupid Cichlid to harass Giant Betta at times; give dense cover and watch them at feeding.
- Golden Vampire Pleco⚠️ With cautionSemi-aggressive · 11 cm · Medium care · 26–30 °C (79–86 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Your 110 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Mascara Barb⚠️ With cautionPeaceful · 12 cm · Medium care · 20–25 °C (68–77 °F)
- Cupid Cichlid is semi-aggressive and may chase or nip the smaller Mascara Barb — plant heavily and break up sight lines.
- Your 110 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
- Keep Mascara Barb in a shoal of 8+ or it gets stressed and nippy.
- Medusa Pleco⚠️ With cautionPeaceful · 12 cm · Medium care · 26–30 °C (79–86 °F)
- Your 110 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
- Murray River Rainbowfish⚠️ With cautionPeaceful · 11 cm · Easy care · 15–26 °C (59–79 °F)
- Cupid Cichlid is semi-aggressive and may chase or nip the smaller Murray River Rainbowfish — plant heavily and break up sight lines.
- Keep Murray River Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Pearl Gourami⚠️ With cautionPeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Cupid Cichlid to harass Pearl Gourami at times; give dense cover and watch them at feeding.
- Your 110 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
- Pictus Catfish⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 22–27 °C (72–81 °F)
- Cupid Cichlid and Pictus Catfish can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Polka-dot Loach⚠️ With cautionSemi-aggressive · 13 cm · Medium care · 24–28 °C (75–82 °F)
- Cupid Cichlid and Polka-dot Loach can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Powder Blue Cichlid⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 24–28 °C (75–82 °F)
- pH preferences only just meet (Cupid Cichlid 5–7 vs Powder Blue Cichlid 7.5–8.5) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (1–8 vs 10–20 dGH) — a compromise, not a perfect match.
- Cupid Cichlid and Powder Blue Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~170 L this pairing really wants — crowding raises aggression.
- Keep Powder Blue Cichlid in a shoal of 6+ or it gets stressed and nippy.
- Rubber Lip Pleco⚠️ With cautionPeaceful · 12 cm · Easy care · 20–26 °C (68–79 °F)
- Your 110 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
- T-bar Cichlid⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 22–28 °C (72–82 °F)
- Cupid Cichlid and T-bar Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Tiger Betta⚠️ With cautionSemi-aggressive · 11 cm · Hard care · 22–27 °C (72–81 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Cupid Cichlid and Alligator Gar are both territorial and at least one is outright aggressive — expect serious fighting.
- Cupid Cichlid is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Your 110 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Two assertive fish, one genuinely aggressive: Cupid Cichlid and Clown Knifefish will hold territory and clash.
- Cupid Cichlid is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
- Your 110 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Size gap is too large (100 vs 12 cm): Fire Eel will treat Cupid Cichlid as food.
- Cupid Cichlid and Fire Eel can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 110 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Size gap is too large (90 vs 12 cm): Koi will treat Cupid Cichlid as food.
- One likes softer water and the other harder (1–8 vs 9–18 dGH) — a compromise, not a perfect match.
- Your 110 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Cupid Cichlid and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Size gap is too large (120 vs 12 cm): Redtail Catfish will treat Cupid Cichlid as food.
- Your 110 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Cupid Cichlid and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.
- Spotted Gar (90 cm) is big enough to swallow the 12 cm Cupid Cichlid whole.
- Your 110 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Cupid Cichlid and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Wels Catfish (300 cm) is big enough to swallow the 12 cm Cupid Cichlid whole.
- Your 110 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Two assertive fish, one genuinely aggressive: Cupid Cichlid and Wolf Cichlid will hold territory and clash.
- Wolf Cichlid (72 cm) is big enough to swallow the 12 cm Cupid Cichlid whole.
- Your 110 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Cupid Cichlid care specs
- Care level
- Medium
- Breeding
- Hard
- Max size
- 12 cm (4.7 in)
- Min tank size
- 110 L (29.1 gal)
- Temperature
- 24–29 °C (75–84 °F)
- pH
- 5–7
- Hardness
- 1–8 dGH
- Lifespan
- 5–8 years
- Diet
- Omnivore
- Swim level
- Middle
- Group size
- 2+ (shoaling)
- Family
- Cichlidae
- Origin
- South America — Amazon and Orinoco river basins (Brazil, Venezuela, Colombia, Peru)
What is a Cupid Cichlid?
The Cupid Cichlid (Biotodoma cupido) is a medium-bodied South American cichlid that sits in an appealing middle ground: larger than a true dwarf like Apistogramma, but far more tractable than the heavyweights of the family. Adults reach around 12 cm (4.7 in), which is substantial enough to hold their own yet manageable in a reasonably sized community aquarium. The common name refers to the species’ most distinctive feature — a sharp, dark lateral spot (sometimes called the “eyespot”) positioned roughly mid-flank, reminiscent of Cupid’s mark. Set against olive-green to turquoise flanks etched with rows of iridescent scales and framed by a red-rimmed eye, the effect is genuinely striking in a dimly lit, planted blackwater setup.
What makes B. cupido particularly appealing to intermediate hobbyists is its temperament. Cichlids often carry a reputation for relentless aggression, but Cupid Cichlids are considerably more peaceable outside of breeding situations. A well-matched pair will occupy a defined territory without terrorising every neighbour in the tank. That said, they are classified as semi-aggressive for good reason — spawning pairs become noticeably more assertive, and cramped quarters will amplify any tension. Treat them as an honest medium-difficulty species: not a beginner fish, but well within reach for anyone who has managed soft-water chemistry before.
Where do Cupid Cichlids come from?
Biotodoma cupido is native to the Amazon and Orinoco river basins, with a range spanning Brazil, Venezuela, Colombia and Peru. In the wild it inhabits slow-moving to near-static water: flooded forest margins, leaf-littered backwaters, and heavily vegetated shallows where tannin-stained water absorbs light before it reaches the substrate. This is classic Amazonian blackwater — warm, extremely soft, and acidic, often with pH readings well below 6.0 in undisturbed habitat.
That origin has direct implications for captive care. The species evolved in water that most municipal tap supplies simply cannot replicate without intervention. Understanding where this fish comes from makes it obvious why hard, alkaline water stresses it so quickly: every biological system from enzyme function to colour expression is calibrated for soft-acid conditions.
What size tank does a Cupid Cichlid need, and how should it be set up?
The minimum for a pair is 110 litres (29 gallons), and larger is genuinely better. A footprint of at least 90 cm (36 in) length gives a breeding pair enough territory to coexist without constant confrontation, and leaves room to divide the tank visually with hardscape.
Substrate should be fine sand — B. cupido sifts the bottom when foraging, and gravel irritates the delicate structures involved. Build a landscape of driftwood tangles, branchy wood and smooth stones to create natural territory boundaries. Dense planting with species tolerant of soft acidic water (Java fern, Anubias tied to wood, cryptocorynes) completes the look and provides security. A generous layer of dried Indian almond or catappa leaves on the substrate serves double duty: it mimics the natural leaf-litter environment and releases tannins that further acidify and colour the water. Lighting should be subdued; bright overhead light makes this species skittish and washes out colour.
Filtration must be gentle. A powerful canister pointed directly at open water creates a current that contradicts everything this fish expects from its habitat. Diffuse the outlet with a spray bar or sponge, or use a large sponge filter. The goal is clean water with minimal surface disturbance.
What water parameters do Cupid Cichlids need?
- Temperature: 24–29 °C (75–84 °F). The mid-range of 25–27 °C suits day-to-day keeping; slightly warmer temperatures can encourage spawning.
- pH: 5.0–7.0. In practice, aim for 5.5–6.8 for best long-term health and colour.
- Hardness: 1–8 dGH. Soft water is non-negotiable.
Most tap water fails on hardness and pH. The practical solution is reverse-osmosis (RO) water remineralised to a low GH of 2–4, then blended with dechlorinated tap to hit target parameters. Peat filtration and Indian almond leaves lower pH gradually and are useful maintenance tools. Test water parameters weekly — pH drift is common in very soft, lightly buffered systems. Stable, consistent readings matter far more than perfection on any single day.
What do Cupid Cichlids eat?
Biotodoma cupido is an omnivore in the wild, picking invertebrates, small organisms and organic matter from the substrate and water column. In the aquarium, a mixed diet keeps them in best condition:
- Staple: Quality small cichlid pellets or granules, sized for a 12 cm (4.7 in) fish.
- Protein top-ups: Frozen or live bloodworms, white mosquito larvae, daphnia, and artemia (brine shrimp). Variety is more important than any single item.
- Occasional: Blanched vegetables such as spinach or courgette; some individuals will graze these readily.
Feed once or twice daily in amounts consumed within two to three minutes. Cupid Cichlids are mid-water feeders that will come up or drift down slightly to intercept food, but sinking pellets work well since the species also sifts the substrate. Overfeeding in soft-water setups fouls water chemistry quickly, so err on the side of moderation and remove uneaten food promptly.
Are Cupid Cichlids aggressive — and what fish can live with them?
Cupid Cichlids are semi-aggressive, which in practice means they are territorial rather than predatory. A settled pair will claim and defend a zone of the tank, particularly around any flat surface they consider a potential spawning site, but they do not actively hunt down other fish the way an Oscar or Jack Dempsey would.
Good tank-mates are peaceful South Americans that occupy different zones: small schooling tetras (cardinal, rummy-nose, ember) in the upper middle column add movement without threatening the cichlids’ territory; corydoras catfish work the substrate underneath; otocinclus handle algae on plant leaves. Avoid any cichlid large enough to bully B. cupido, and avoid fin-nippers that will harass slower-swimming fish. Small invertebrates such as shrimp are likely to be eaten.
For a full list of compatible and incompatible species, see Cupid Cichlid tank mates.
How do you tell male and female Cupid Cichlids apart?
Sexing Biotodoma cupido is fairly reliable in mature fish. Males are noticeably larger — a full-grown male at 12 cm (4.7 in) will typically dwarf a female by several centimetres. Males also develop more vivid colouration across the flanks and a stronger iridescent sheen, and their dorsal and anal fin rays elongate into pointed extensions at the rear edge, which is one of the clearest structural markers once the fish are past juvenile size.
Females remain smaller throughout life and are less intensely coloured in neutral conditions, though a gravid female develops a distinctive rosy-pink flush across the belly — a reliable indicator that she is carrying eggs and that a spawn may be imminent. Outside of breeding condition, females can look quite drab compared to males in peak colour, which can make early identification of juveniles difficult before those secondary characters fully develop.
How do Cupid Cichlids breed?
Biotodoma cupido is a substrate spawner that forms monogamous pairs, a trait typical of Geophagine cichlids. It carries a Hard breeding difficulty rating — not because the mechanics are complicated, but because the water chemistry requirements must be genuinely met and the pair dynamic must be managed carefully.
Conditioning the pair on high-protein live and frozen foods at slightly elevated temperature (27–29 °C / 81–84 °F) usually stimulates spawning. The pair will select and clean a flat surface — a smooth stone, a broad leaf or a piece of flat driftwood — and deposit eggs in neat rows. Both parents actively defend the site. In many Geophagine species eggs or newly hatched wrigglers are moved to shallow pits; B. cupido shows similar behaviours.
The main breeding challenges are: achieving compatible water parameters soft and acidic enough to promote fertilisation; maintaining a pair that is bonded rather than one fish persecuting the other; and providing enough space for parents to defend fry without chronic stress. A dedicated breeding tank of 110 L+ with very soft, slightly tannin-coloured water and minimal disturbance gives the best results. Raising fry requires tiny live foods such as microworms or newly hatched brine shrimp nauplii in the early stages.
What diseases are common in Cupid Cichlids?
Like most soft-water Amazonian species, Cupid Cichlids are more susceptible to disease when water chemistry drifts outside their preferred range. The most common issues are:
- Ich (white spot): The classic white-dot protozoan, triggered most often by temperature fluctuations or the stress of being kept in water that is too hard or alkaline. Prevention is a stable, warm, correctly parameterised tank.
- Hole-in-the-head (HITH): Pitting lesions around the head and lateral line, associated with poor water quality, dietary deficiencies and, in some cases, activated carbon use. Varied diet, clean water and regular water changes are the main preventive measures.
- Bacterial infections and fin deterioration: Secondary to physical damage from aggression or to chronic stress. Ensure territory boundaries are adequate and reduce any sources of persistent stress.
- Intestinal parasites: Imported wild-caught fish in particular may arrive with internal parasites. A quarantine period of four to six weeks in a separate tank before introduction to the display aquarium is strongly recommended.
Health note: this care profile covers husbandry and prevention, not diagnosis or medication dosing. If your fish show signs of illness, cross-reference symptoms against a reputable fish-health resource and consult an aquatic veterinarian where possible before treating.
How long do Cupid Cichlids live?
With proper care, Biotodoma cupido lives for 5–8 years in captivity. That lifespan is meaningful — this is not a short-lived fish you replace regularly, it is a species you build a relationship with over the better part of a decade. Achieving the upper end of that range depends almost entirely on keeping water chemistry consistently within the species’ soft-acid requirements and providing a varied, high-quality diet. Fish kept in hard tap water at borderline-acceptable parameters seldom reach their potential lifespan; fish kept in well-managed, soft-water biotope setups regularly do.
Frequently asked questions
Can Cupid Cichlids live with other cichlids?
With care, yes. They are less aggressive than most cichlids of comparable size, but they do defend a territory, especially when breeding. Best kept with other peaceful South Americans — small tetras, corydoras and otocinclus — rather than with dominant cichlids that will outcompete them.
What water conditions do Cupid Cichlids need?
They come from soft, acidic Amazonian blackwater. Aim for pH 5.5–6.8 and hardness below 8 dGH. Hard, alkaline tap water will suppress colour and reduce longevity. Use RO water blended with tap, or condition with peat or Indian almond leaves.
What you need to keep a cupid cichlid
The baseline is a heated, filtered 110 L+ tank: a reliable heater to hold 24–29 °C (75–84 °F), a gentle filter that won't batter a cupid cichlid in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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