Photo: Rainer Schmitt, 2004 (CC BY-SA 3.0) — via Wikimedia Commons
Tailspotted Oto (Otocinclus macrospilus)
A nano algae-eater from Peru with a distinctive interrupted lateral stripe — the otocinclus that aquarists keep misidentifying.
Will it live with a Tailspotted Oto?
We compare each fish against your tailspotted oto on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- African Dwarf Frog✅ CompatiblePeaceful · 4 cm · Medium care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Amapá Tetra✅ CompatiblePeaceful · 4 cm · Medium care · 24–27 °C (75–81 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Black Darter Tetra✅ CompatibleSemi-aggressive · 4 cm · Hard care · 21–28 °C (70–82 °F)
- Peaceful + Semi-aggressive, 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Blackwing Hatchetfish✅ CompatiblePeaceful · 3.5 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Blackwing Hatchetfish in a shoal of 6+ or it gets stressed and nippy.
- Blue Danio✅ CompatiblePeaceful · 4 cm · Easy care · 21–26 °C (70–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Blue Danio in a shoal of 6+ or it gets stressed and nippy.
- Blue Emperor Tetra✅ CompatiblePeaceful · 4 cm · Medium care · 23–27 °C (73–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Blue Emperor Tetra in a shoal of 6+ or it gets stressed and nippy.
- Cardinal Tetra✅ CompatiblePeaceful · 4 cm · Medium care · 23–27 °C (73–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Cardinal Tetra in a shoal of 6+ or it gets stressed and nippy.
- Clown Killifish✅ CompatiblePeaceful · 3.5 cm · Medium care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- 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)
- Both are peaceful, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Emperor Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 23–27 °C (73–81 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Emperor Tetra 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)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- 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.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Flame Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Flame Tetra in a shoal of 6+ or it gets stressed and nippy.
- Ghost Shrimp✅ CompatiblePeaceful · 4 cm · Easy care · 18–28 °C (64–82 °F)
- Both are peaceful, 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Ghost Shrimp in a shoal of 6+ or it gets stressed and nippy.
- Glowlight Rasbora✅ CompatiblePeaceful · 3.5 cm · Easy care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Glowlight Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Glowlight Tetra✅ CompatiblePeaceful · 4 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Glowlight Tetra in a shoal of 6+ or it gets stressed and nippy.
- Golden Dwarf Barb✅ CompatiblePeaceful · 4 cm · Easy care · 18–24 °C (64–75 °F)
- Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Golden Dwarf Barb in a shoal of 6+ or it gets stressed and nippy.
- Jelly Bean Tetra✅ CompatiblePeaceful · 4 cm · Medium care · 20–26 °C (68–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Jelly Bean Tetra in a shoal of 10+ or it gets stressed and nippy.
- Marbled Hatchetfish✅ CompatiblePeaceful · 4 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Marbled Hatchetfish in a shoal of 6+ or it gets stressed and nippy.
- Northern Glowlight Danio✅ CompatiblePeaceful · 3.5 cm · Medium care · 18–24 °C (64–75 °F)
- Compatible on the things that matter: shared water near 22–24 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Northern Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Otocinclus✅ CompatiblePeaceful · 4 cm · Medium care · 21–26 °C (70–79 °F)
- Both are peaceful, 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.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Otocinclus in a shoal of 6+ or it gets stressed and nippy.
- Phoenix Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Phoenix Tetra in a shoal of 8+ or it gets stressed and nippy.
- Pygmy Corydoras✅ CompatiblePeaceful · 3.2 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Pygmy Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Rainbow Emperor Tetra✅ CompatibleSemi-aggressive · 3.6 cm · Medium 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
- African Butterfly Cichlid⚠️ With cautionSemi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Amazon Puffer⚠️ With cautionPeaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Amazon Puffer in a shoal of 6+ or it gets stressed and nippy.
- Ash Lipped Apisto⚠️ With cautionSemi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Black Ruby Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
- Bleeding Heart Tetra⚠️ With cautionSemi-aggressive · 7 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Bleeding Heart Tetra in a shoal of 6+ or it gets stressed and nippy.
- Bright Diamond Tetra⚠️ With cautionPeaceful · 7 cm · Hard care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Bright Diamond Tetra in a shoal of 8+ or it gets stressed and nippy.
- Buenos Aires Tetra⚠️ With cautionSemi-aggressive · 7 cm · Easy care · 18–26 °C (64–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Buenos Aires Tetra in a shoal of 6+ or it gets stressed and nippy.
- Colombian Tetra⚠️ With cautionSemi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~114 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
- Congo Tetra⚠️ With cautionPeaceful · 8 cm · Medium care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
- Dwarf Chain Loach⚠️ With cautionPeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
- Glass Catfish⚠️ With cautionPeaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Glass Catfish in a shoal of 6+ or it gets stressed and nippy.
- Humpbacked Tetra⚠️ With cautionSemi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Humpbacked Tetra in a shoal of 8+ or it gets stressed and nippy.
- Melon Barb⚠️ With cautionPeaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Melon Barb in a shoal of 8+ or it gets stressed and nippy.
- Morse Code Corydoras⚠️ With cautionPeaceful · 5 cm · Medium care · 23–26 °C (73–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Rounded Filament Barb⚠️ With cautionPeaceful · 7 cm · Medium care · 22–27 °C (72–81 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Rounded Filament Barb in a shoal of 6+ or it gets stressed and nippy.
- Tiger Barb⚠️ With cautionSemi-aggressive · 7 cm · Easy care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~95 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Tiger Barb in a shoal of 6+ or it gets stressed and nippy.
- Discus⛔ Not recommendedPeaceful · 20 cm · Hard care · 28–31 °C (82–88 °F)
- Temperature needs don't overlap (Tailspotted Oto 22–27 °C vs Discus 28–31 °C).
- Your 75 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Keep Discus in a shoal of 6+ or it gets stressed and nippy.
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.
Tailspotted Oto care specs
- Care level
- Medium
- Breeding
- Hard
- Max size
- 3.5 cm (1.4 in)
- Min tank size
- 40 L (10.6 gal)
- Temperature
- 22–27 °C (72–81 °F)
- pH
- 6–7.5
- Hardness
- 2–12 dGH
- Lifespan
- 3–5 years
- Diet
- Herbivore
- Swim level
- Bottom
- Group size
- 6+ (shoaling)
- Family
- Loricariidae
- Origin
- South America — upper Amazon basin (Colombia, Ecuador, Peru)
What is a Tailspotted Oto?
The Tailspotted Oto (Otocinclus macrospilus) is a miniature armoured catfish from the upper Amazon basin, reaching just 3.5 cm (1.4 in) fully grown. It belongs to the family Loricariidae and shares the suckermouth, bony scutes and algae-grazing lifestyle of its relatives, but is one of the smallest members of the genus. The species is regularly exported from Peru, Colombia and Ecuador, though it is routinely mislabelled in the hobby as O. affinis or O. vittatus. The authentic Tailspotted Oto is identified by its interrupted lateral stripe: the dark band fades before the tail and ends in a discrete caudal spot — the marking that gives the fish its name. Despite its small size, this is not a beginner fish; the species is fragile on import and demanding about water maturity, but rewards the prepared aquarist with tireless algae work and engaging schooling behaviour.
Where do Tailspotted Otos come from?
Wild O. macrospilus inhabit shallow, clear-flowing streams and river margins in the upper Amazon basin, with most trade stock coming from Peruvian exports. Their native waterways are fed by Andean runoff — soft, slightly acidic, oxygen-rich and cooler than the lowland tropics — rarely exceeding 27 °C (81 °F) even at the dry season peak. The fish graze biofilm and soft algae from rocks, leaves and root tangles in water with low dissolved solids and gentle to moderate flow. Translating this into aquarium conditions is the core challenge of keeping the species well.
What tank size and setup do Tailspotted Otos need?
A minimum of 40 litres (10 gallons) is required for a group, and this assumes the tank has been running and maturing for at least six to eight weeks before the otos arrive. A longer, shallower tank is preferable to a tall column — otos are bottom and mid-level grazers and benefit more from horizontal surface area than depth.
Substrate should be fine sand or smooth gravel; sharp substrate can damage their soft undersides. Dense planting with broad-leaved species — Anubias, Amazon sword, broad cryptocorynes — provides grazing surfaces and security. Driftwood and smooth river stones complete the layout. Keep flow moderate; a sponge filter or gentle hang-on-back suits this small species well. A consistent lighting schedule encourages the natural algae growth on plant leaves and glass that forms the backbone of their diet.
What water parameters do Tailspotted Otos need?
- Temperature: 22–27 °C (72–81 °F). They tolerate slightly cooler conditions than many tropical fish, which is consistent with their Andean-stream origin.
- pH: 6.0–7.5. Soft, mildly acidic water is ideal; near-neutral is acceptable if hardness is low.
- Hardness: 2–12 dGH. This is a soft-water species; hard, mineral-rich water stresses them over time.
Stability is as important as the numbers themselves. Otos handle gradual shifts poorly and are particularly vulnerable in the weeks immediately after introduction. Always drip-acclimate new arrivals over 60–90 minutes, never dump them from a bag. Test water weekly, perform 20–30 % water changes on a regular schedule and ensure the filter is well established — high ammonia or nitrite is lethal to a fish that arrives already stressed from transit.
What do Tailspotted Otos eat?
Tailspotted Otos are obligate herbivores. In a mature, planted tank they will graze biofilm and soft algae continuously throughout the day, working methodically across glass, leaves and wood. This grazing behaviour is satisfying to watch but also a welfare signal: a fish that has stopped moving and grazing is almost certainly starving.
Supplement naturally occurring algae with:
- Blanched vegetables — zucchini (courgette) and cucumber are the most accepted; hold them down with a clip or a small weight.
- Algae wafers — sinking wafers designed for plecostomus provide a reliable fallback when tank algae runs low.
- Spirulina-based foods — spirulina wafers or flakes left to sink supplement their plant-based nutrition.
Remove uneaten vegetable pieces after 24 hours to avoid fouling the water. Do not rely on a “clean” tank to feed them; even a heavily algaed tank may not produce enough biofilm for a group of six or more active grazers.
Are Tailspotted Otos compatible with other fish?
Tailspotted Otos are entirely peaceful and present no aggression towards tankmates of any size. Their own company matters far more than what else shares the tank: they must be kept in groups of at least six, and groups of eight to twelve are visibly more settled. A lone oto or a pair will hide, waste away and die within weeks.
Because they occupy the bottom level and focus exclusively on grazing, they do not compete with mid-water or surface-dwelling species. Classic companions include small tetras, rasboras, ember tetras, corydoras, cherry shrimp and peaceful dwarf cichlids. Avoid large cichlids, aggressive fish, or any species known to nip fins or harass bottom dwellers — otos have no meaningful defence. Large, food-competing plecos may out-compete them for algae wafers, so feed in multiple spots if mixed.
For a curated list of proven pairings, see Tailspotted Oto tank mates.
How do you tell male from female Tailspotted Otos?
Sexual dimorphism in O. macrospilus is subtle but reliable when viewed from above. Females are noticeably rounder and broader in the body, especially when gravid — the abdomen widens visibly on either side of the fish when viewed dorsally. Males are slimmer and more streamlined. Viewed from the side, a gravid female will appear distinctly fuller behind the pectoral fins. This is the only consistent visual cue; colouration and fin shape do not differ meaningfully between sexes. Accurate sexing requires observing a group together, as individual fish are easier to misread in isolation.
Can you breed Tailspotted Otos in an aquarium?
Breeding is rated hard and is rarely achieved outside specialist setups. The typical trigger mimics a seasonal shift: drop the temperature toward the lower end of the range (around 22 °C / 72 °F) then gradually raise it, while conditioning the group on varied, algae-based foods. When spawning occurs, the female deposits small clusters of eggs on glass or plant leaves; the male fertilises them in passing. Otos provide no parental care. Eggs hatch in roughly two to three days, and the minute fry need infusoria or similar fine foods before graduating to biofilm and crushed wafer. Pristine water throughout is non-negotiable — this is not a community-tank project.
What diseases affect Tailspotted Otos?
The most serious risk is starvation, which mimics disease — lethargy, wasting, discolouration — but is a husbandry failure. Check new arrivals for hollow bellies and active grazing from day one.
Beyond nutrition, the main threats are:
- Ich (white spot) — fine white grains; triggered by temperature swings or an unquarantined fish. Quarantine new arrivals for two to three weeks.
- Velvet — a dusty golden sheen from Oodinium; watch for scratching behaviour, as it can be hard to spot on a mottled fish.
- Bacterial infections / Columnaris — linked to water-quality decline; fix the chemistry before reaching for any treatment.
Otos are sensitive to many standard medications, particularly copper-based products. Their bony scutes offer no protection against chemical damage. Prevention through stable, clean water is always the better path.
Health note: medication dosing and disease diagnosis are beyond the scope of a care profile. For sick fish, confirm symptoms against a reputable veterinary or fish-health source before treating, and always check drug compatibility with Loricariidae before adding anything to the water.
How long do Tailspotted Otos live?
With consistent care a Tailspotted Oto can live 3–5 years. In practice, many purchased fish are lost within the first month — not because the species is short-lived but because they arrive malnourished and land in tanks that cannot feed them. An oto that clears the first three months has already passed the hardest test. A mature, algae-rich tank, a stable group of companions and regular vegetable supplements are all it takes to see that lifespan through.
Frequently asked questions
How is the Tailspotted Oto different from the common Otocinclus?
The key visual difference is the lateral stripe: in Otocinclus macrospilus it is interrupted and fades before reaching the tail, ending in a distinct caudal spot; in the common O. vittatus the stripe runs unbroken to the tail base. O. macrospilus is also slightly smaller and comes predominantly from Peruvian exports rather than Brazilian ones.
Why do Tailspotted Otos die shortly after purchase?
New-import losses trace almost entirely to starvation and stress. These fish arrive malnourished after transit and need an established tank with abundant biofilm and soft green algae from day one. Never add them to a new or sterile tank. Acclimate slowly, keep the group at six or more, and supplement with blanched zucchini and algae wafers immediately.
What you need to keep a tailspotted oto
The baseline is a heated, filtered 40 L+ tank: a reliable heater to hold 22–27 °C (72–81 °F), a gentle filter that won't batter a tailspotted oto in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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