Photo: ATuin-hek at English Wikipedia (CC0) — via Wikimedia Commons
Scarlet Badis (Dario dario)
A jewel-bright micro predator barely 2 cm long — the crown jewel of nano planted tanks, with the personality of a fish ten times its size.
Will it live with a Scarlet Badis?
We compare each fish against your scarlet badis on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Assassin Snail✅ CompatiblePeaceful · 3 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Blackwing Hatchetfish✅ CompatiblePeaceful · 3.5 cm · Medium care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Blackwing Hatchetfish in a shoal of 6+ or it gets stressed and nippy.
- Cherry Shrimp✅ CompatiblePeaceful · 3 cm · Easy care · 18–28 °C (64–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Cherry Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Clown Killifish✅ CompatiblePeaceful · 3.5 cm · Medium care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Clown Killifish in a shoal of 6+ or it gets stressed and nippy.
- Crimson Red Betta✅ CompatiblePeaceful · 3.5 cm · Hard care · 24–29 °C (75–84 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Crystal Red Shrimp✅ CompatiblePeaceful · 2.5 cm · Hard care · 20–24 °C (68–75 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Crystal Red Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Dawn Tetra✅ CompatiblePeaceful · 2.5 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Dwarf Spotted Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Dwarf Spotted Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Endler's Livebearer✅ CompatiblePeaceful · 3 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Endler's Livebearer in a shoal of 6+ or it gets stressed and nippy.
- Eyespot Rasbora✅ CompatiblePeaceful · 3.5 cm · Medium care · 20–25 °C (68–77 °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 Eyespot Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Fire Red Licorice Gourami✅ CompatiblePeaceful · 3.5 cm · Hard care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Glowlight Danio✅ CompatiblePeaceful · 3 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Gold Ring Danio✅ CompatiblePeaceful · 3 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 Gold Ring Danio in a shoal of 8+ or it gets stressed and nippy.
- Green Neon Tetra✅ CompatiblePeaceful · 2.5 cm · Hard care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Green Neon Tetra in a shoal of 8+ or it gets stressed and nippy.
- Lambchop Rasbora✅ CompatiblePeaceful · 3 cm · Medium care · 23–28 °C (73–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
- Keep Lambchop Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Malaysian Trumpet Snail✅ CompatiblePeaceful · 3 cm · Easy care · 21–27 °C (70–81 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Neon Blue Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–26 °C (73–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
- Keep Neon Blue Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Neon Tetra✅ CompatiblePeaceful · 3 cm · Easy care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Neon Tetra in a shoal of 6+ or it gets stressed and nippy.
- Nerite Snail✅ CompatiblePeaceful · 2.5 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Pygmy Corydoras✅ CompatiblePeaceful · 3.2 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Pygmy Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Red Lip Nerite Snail✅ CompatiblePeaceful · 2 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Tail-spot Corydoras✅ CompatiblePeaceful · 3 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Tail-spot Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Tiger Shrimp✅ CompatiblePeaceful · 3 cm · Hard care · 20–25 °C (68–77 °F)
- Compatible on the things that matter: shared water near 22–25 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Tiger Shrimp in a shoal of 6+ or it gets stressed and nippy.
- Trinidad Guppy✅ CompatiblePeaceful · 3 cm · Easy care · 19–24 °C (66–75 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
- Black Darter Tetra⚠️ With cautionSemi-aggressive · 4 cm · Hard care · 21–28 °C (70–82 °F)
- Scarlet Badis and Black Darter Tetra can both be territorial; doable with space and dense planting, but watch for chasing.
- Watch for Black Darter Tetra picking off any scarlet badis small enough to fit in its mouth.
- Celestial Pearl Danio⚠️ With cautionPeaceful · 2 cm · Medium care · 22–26 °C (72–79 °F)
- Expect Scarlet Badis to harass Celestial Pearl Danio at times; give dense cover and watch them at feeding.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Chili Rasbora⚠️ With cautionPeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Scarlet Badis is semi-aggressive and may chase or nip the smaller Chili Rasbora — plant heavily and break up sight lines.
- Keep Chili Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Ember Tetra⚠️ With cautionPeaceful · 2 cm · Easy care · 24–28 °C (75–82 °F)
- Expect Scarlet Badis to harass Ember Tetra at times; give dense cover and watch them at feeding.
- Keep Ember Tetra in a shoal of 8+ or it gets stressed and nippy.
- Emerald Dwarf Danio⚠️ With cautionPeaceful · 2 cm · Medium care · 20–24 °C (68–75 °F)
- Expect Scarlet Badis to harass Emerald Dwarf Danio at times; give dense cover and watch them at feeding.
- Keep Emerald Dwarf Danio in a shoal of 8+ or it gets stressed and nippy.
- Exclamation Point Rasbora⚠️ With cautionPeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Scarlet Badis and Exclamation Point Rasbora are close in size, but the semi-aggressive one tends to dominate — add exclamation point rasbora in a group to spread the pressure.
- Keep Exclamation Point Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Hummingbird Tetra⚠️ With cautionPeaceful · 1.8 cm · Hard care · 22–27 °C (72–81 °F)
- Scarlet Badis and Hummingbird Tetra are close in size, but the semi-aggressive one tends to dominate — add hummingbird tetra in a group to spread the pressure.
- Keep Hummingbird Tetra in a shoal of 8+ or it gets stressed and nippy.
- Neon Green Rasbora⚠️ With cautionPeaceful · 2 cm · Easy care · 22–26 °C (72–79 °F)
- Expect Scarlet Badis to harass Neon Green Rasbora at times; give dense cover and watch them at feeding.
- Keep Neon Green Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Pea Puffer⚠️ With cautionSemi-aggressive · 2.5 cm · Medium care · 24–28 °C (75–82 °F)
- Scarlet Badis and Pea Puffer can both be territorial; doable with space and dense planting, but watch for chasing.
- Rainbow Emperor Tetra⚠️ With cautionSemi-aggressive · 3.6 cm · Medium care · 22–28 °C (72–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Watch for Rainbow Emperor Tetra picking off any scarlet badis small enough to fit in its mouth.
- Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
- Ramshorn Snail⚠️ With cautionPeaceful · 2 cm · Easy care · 20–28 °C (68–82 °F)
- Scarlet Badis is semi-aggressive and may chase or nip the smaller Ramshorn Snail — plant heavily and break up sight lines.
- Ruby Tetra⚠️ With cautionPeaceful · 2 cm · Medium care · 23–28 °C (73–82 °F)
- Expect Scarlet Badis to harass Ruby Tetra at times; give dense cover and watch them at feeding.
- Keep Ruby Tetra in a shoal of 8+ or it gets stressed and nippy.
- Serpae Tetra⚠️ With cautionSemi-aggressive · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Scarlet Badis and Serpae Tetra can both be territorial; doable with space and dense planting, but watch for chasing.
- Watch for Serpae Tetra picking off any scarlet badis small enough to fit in its mouth.
- Keep Serpae Tetra in a shoal of 6+ or it gets stressed and nippy.
- Strawberry Rasbora⚠️ With cautionPeaceful · 2 cm · Medium care · 23–28 °C (73–82 °F)
- Expect Scarlet Badis to harass Strawberry Rasbora at times; give dense cover and watch them at feeding.
- Keep Strawberry Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Tiger Badis⚠️ With cautionSemi-aggressive · 4 cm · Medium care · 22–24 °C (72–75 °F)
- Scarlet Badis and Tiger Badis can both be territorial; doable with space and dense planting, but watch for chasing.
- Scarlet Badis is small enough to tempt Tiger Badis; only risk it in a densely planted setup with hiding spots.
- Tucano Tetra⚠️ With cautionPeaceful · 1.7 cm · Hard care · 23–28 °C (73–82 °F)
- Scarlet Badis is semi-aggressive and may chase or nip the smaller Tucano Tetra — plant heavily and break up sight lines.
- Keep Tucano Tetra in a shoal of 10+ or it gets stressed and nippy.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Scarlet Badis and Alligator Gar are both territorial and at least one is outright aggressive — expect serious fighting.
- Scarlet Badis is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Your 75 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: Scarlet Badis and Clown Knifefish will hold territory and clash.
- Size gap is too large (90 vs 2 cm): Clown Knifefish will treat Scarlet Badis as food.
- Your 75 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 2 cm): Fire Eel will treat Scarlet Badis as food.
- Scarlet Badis and Fire Eel can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 75 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 2 cm): Koi will treat Scarlet Badis as food.
- Your 75 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)
- Scarlet Badis and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Redtail Catfish (120 cm) is big enough to swallow the 2 cm Scarlet Badis whole.
- Your 75 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)
- Scarlet Badis 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 2 cm Scarlet Badis whole.
- Your 75 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)
- Scarlet Badis and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Scarlet Badis is bite-sized to a 300 cm predatory wels catfish — it will be eaten.
- Your 75 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: Scarlet Badis and Wolf Cichlid will hold territory and clash.
- Wolf Cichlid (72 cm) is big enough to swallow the 2 cm Scarlet Badis whole.
- Your 75 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.
Scarlet Badis care specs
- Care level
- Medium
- Breeding
- Medium
- Max size
- 2 cm (0.8 in)
- Min tank size
- 38 L (10 gal)
- Temperature
- 22–27 °C (72–81 °F)
- pH
- 6.5–7.5
- Hardness
- 2–10 dGH
- Lifespan
- 2–4 years
- Diet
- Carnivore
- Swim level
- Bottom
- Group size
- 2+ (shoaling)
- Family
- Badidae
- Origin
- India — fast-flowing hill streams of West Bengal and Assam (Brahmaputra drainage)
What is a Scarlet Badis?
The scarlet badis (Dario dario) is one of the smallest and most strikingly coloured perciform fish in the freshwater hobby. Adult males top out at roughly 2 cm (0.8 in) and carry seven vivid iridescent blue bars across an orange-red body — extraordinary colouration for a fish you can balance on your fingertip. Females are a plain silver-brown and slightly smaller still, making sexual dimorphism as pronounced as in any dwarf cichlid.
Despite its size, the scarlet badis has genuine personality. Males display constantly, fanning their fins to rival males and courting females with slow, deliberate dances. They are micro predators, feeding on tiny invertebrates in the wild and refusing to recognise flake as food — a point that sets expectations before purchase. For aquarists willing to provide live and frozen micro foods and a densely planted nano setup, the scarlet badis is a spectacular and deeply rewarding species.
Where do Scarlet Badis come from?
Dario dario is native to the Brahmaputra river drainage in northeastern India — specifically the clear, shallow hill streams and their margins in West Bengal and Assam. Wild habitat is typified by cool, soft, slightly acidic water flowing over sand and gravel, with dense aquatic and riparian vegetation providing both hunting territory and cover from larger predators.
This origin drives every care decision. The species wants cool, very soft, slightly acidic water — the opposite of hard-water livebearers — and heavy planting that mimics the dense stream margins it hunts through in nature. Replicate those conditions and the fish thrive; cut corners on water chemistry and they fade quickly, losing colour and appetite within weeks.
What size tank does a Scarlet Badis need?
The practical minimum is 38 litres (10 gallons), though many experienced keepers use tanks in the 20–40 L (5–10 gal) range and manage them as dedicated nano species tanks. Despite the scarlet badis’s tiny body — 2 cm (0.8 in) fully grown — it needs horizontal swimming space and enough territory for males to establish their own patches without constant conflict.
A longer, lower tank profile suits this bottom-to-mid dweller far better than a tall column. Heavily plant the tank with fine-leaved foreground and midground plants (Java moss, Hemianthus, Staurogyne, floating plants for diffused light), and add small driftwood pieces or smooth rocks to break lines of sight between males. Gentle filtration — a sponge filter is ideal — replicates the slow-to-moderate current of hill-stream margins without battering fish that weigh less than a gram.
What water parameters do Scarlet Badis need?
- Temperature: 22–27 °C (72–81 °F). This is cooler than most tropical nano fish — it matters.
- pH: 6.5–7.5, slightly acidic to neutral.
- Hardness: 2–10 dGH, soft to moderately soft.
Stability is paramount. Soft, slightly acidic water — achievable with RO water remineralised to low GH, or a soft local supply — keeps colours vivid and fish healthy. Hard, alkaline tap water stresses the fish and increases susceptibility to disease even if temperature is correct. Cycle the tank fully before adding fish, perform regular partial water changes (roughly 20–25% weekly), and test parameters periodically rather than assuming the tap is adequate.
What do Scarlet Badis eat?
The scarlet badis is a strict carnivore and a specialist micro predator. In the wild it hunts tiny invertebrates — copepods, small insect larvae, worms — all live prey far smaller than a flake of food. Most individuals simply will not recognise dry flake or pellets as edible, regardless of how hungry they are.
A workable feeding plan relies on:
- Live foods — baby brine shrimp (nauplii), microworms, walter worms, daphnia, and small live bloodworms are the most reliable triggers.
- Frozen foods — frozen daphnia, frozen baby brine shrimp, and frozen cyclops are accepted by most individuals once settled.
- Frequency — small portions twice daily is better than one large feeding, as uneaten food in a nano tank degrades water quality rapidly.
Some individuals can eventually be trained onto frozen bloodworms or high-quality small pellets, but plan for live food as the long-term staple. Maintaining a live daphnia culture or regular brine shrimp hatchery is strongly recommended before purchasing this species.
Are Scarlet Badis aggressive — and what fish can live with them?
The scarlet badis has a semi-aggressive temperament that is entirely about territory and rivalry. Males are highly territorial toward each other: in a small tank two males will fight persistently, and the weaker fish will be harassed relentlessly, stop eating, and often die. The rule is one male per small tank, or provide sufficient space and dense planting that two males can hold separate territories without constant contact.
Toward other species, the dynamic flips: the scarlet badis is small enough to be eaten by most community fish and easily outcompeted for food by anything faster. Best companions are fish that share its size range and water requirements but occupy different zones — ember tetras, chili rasboras, and celestial pearl danios (all surface-to-mid swimmers) work well because they ignore the badis and are not outpaced by it at feeding time. Dwarf shrimp (neocaridina, caridina) can coexist but small shrimp juveniles may be picked off; adult shrimp are generally left alone.
For a full compatibility breakdown by species, see Scarlet Badis tank mates.
How do you tell a male from a female Scarlet Badis?
Sexual dimorphism in Dario dario is about as obvious as in any freshwater fish. Males are brilliantly coloured: seven iridescent blue-violet vertical bars cross a fiery orange-red body, the fins are edged in blue and red, and they display constantly by spreading fins and intensifying colour. Females are plain silver-brown with no bars and no coloured fin margins — at first glance they appear to be a completely different fish. Females are also noticeably smaller, often barely reaching 1.5 cm (0.6 in).
This stark difference creates a common problem at purchase: retailers may stock only males (the colourful ones), leaving buyers unable to find females. Always confirm female availability before buying males, and ask to see females in person — an unbanded, drab fish is not the same species at all if the retailer has misidentified stock.
How do Scarlet Badis breed?
Breeding is achievable in a well-conditioned pair and is rated medium difficulty. Males court females with persistent, elaborate fin-display dances; spawning occurs among fine-leaved plants or Java moss, where the pair deposit small adhesive eggs. Unlike bubble-nest builders, the scarlet badis offers no notable parental care — eggs are scattered and left.
To encourage spawning, condition both sexes on plentiful live foods for two to three weeks, provide clumps of Java moss or spawning mops as egg sites, and maintain water at the warm end of the range (around 25–27 °C / 77–81 °F). After spawning, it is advisable to remove adults from the breeding vessel, as eggs and fry may be consumed. Eggs hatch in approximately two to three days; fry are tiny and require infusoria or newly hatched brine shrimp nauplii as first foods before graduating to larger micro foods at a few weeks old.
What are the common diseases of Scarlet Badis?
The scarlet badis’s small size and preference for soft, acidic water makes it sensitive to the usual nano-tank pathogens. The most common problems are:
- Ich (white spot) — tiny white dots on fins and body; caused by temperature swings or chilling below range. Prevention: keep temperature stable within 22–27 °C (72–81 °F) and acclimate new fish slowly.
- Velvet (Oodinium) — a golden-dust sheen, often worse under direct light; common when fish are stressed by poor water quality or incompatible chemistry. Prevention: maintain soft, acidic water and avoid overcrowding.
- Internal parasites — wild-caught or farm-raised fish may carry internal worms; a common reason a specimen refuses food despite appearing otherwise healthy. Prevention: quarantine all new fish for at least two weeks in a separate tank before adding to a display.
- Wasting / hunger refusal — not a disease, but often misread as one. A badis that refuses every food offered and steadily loses weight is almost certainly not receiving appropriate live micro foods. Correct the feeding regimen first.
Health note: medication dosing and disease diagnosis are beyond the scope of a care profile. For a sick fish, verify symptoms against a reputable veterinary or fish-health resource before medicating. Many treatments appropriate for larger fish are harmful at the water volumes and concentrations used in nano tanks.
How long does a Scarlet Badis live?
A well-kept scarlet badis lives 2–4 years. That range is narrower than for larger fish and reflects both the species’s naturally short lifespan and its sensitivity to suboptimal conditions. The most common reason for a short life is inadequate food (dry food refusal left unaddressed), inappropriate water chemistry, or incompatible tank-mates causing chronic stress. Address those three factors and a scarlet badis kept in a stable, planted, correctly fed nano tank will give you the full run of its lifespan — and fill every day of it with colour and activity.
Frequently asked questions
Why won't my scarlet badis eat dry flake or pellets?
Dario dario is a specialist micro predator that instinctively ignores prepared foods. You must offer live or frozen micro foods — baby brine shrimp, daphnia, micro worms, or small bloodworms. With time some individuals can be weaned onto high-quality frozen copepods, but live food is the safest long-term staple.
Can I keep scarlet badis with other fish?
Males are territorial with each other and will intimidate very small, slow-moving tank-mates. Best results come from a single-species nano tank or pairing with fast, similarly sized fish (ember tetras, chili rasboras) that ignore them. Avoid any fish large enough to eat them or nippy enough to stress them.
What you need to keep a scarlet badis
The baseline is a heated, filtered 38 L+ tank: a reliable heater to hold 22–27 °C (72–81 °F), a gentle filter that won't batter a scarlet badis in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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