Photo: Mgroch at pl.wikipedia (CC BY-SA 3.0) — via Wikimedia Commons
Clown Loach (Chromobotia macracanthus)
A boldly striped, comically social loach that grows large, lives for decades, and earns its keep by hoovering up every snail in the tank.
Will it live with a Clown Loach?
We compare each fish against your clown loach on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Altifrons Geophagus✅ CompatibleSemi-aggressive · 25 cm · Medium care · 24–28 °C (75–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 25–28 °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 Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
- Angelicus Synodontis✅ CompatibleSemi-aggressive · 25 cm · Medium care · 23–27 °C (73–81 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Black Collared Catfish✅ CompatibleSemi-aggressive · 27 cm · Hard care · 23–25 °C (73–77 °F)
- Compatible on the things that matter: shared water near 25–25 °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.
- Blackcheek Cichlid✅ CompatibleAggressive · 25 cm · Medium care · 22–28 °C (72–82 °F)
- Peaceful + Aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Blackthroat Cichlid✅ CompatibleAggressive · 25 cm · Hard care · 26–30 °C (79–86 °F)
- Peaceful + Aggressive, but with no direct clash here, and their water overlaps around 26–30 °C — no size, zone or temperament conflicts.
- Cuban Cichlid✅ CompatibleAggressive · 30 cm · Hard care · 24–28 °C (75–82 °F)
- Peaceful + Aggressive, but with no direct clash here, and their water overlaps around 25–28 °C — no size, zone or temperament conflicts.
- Elephant-nose Knifefish✅ CompatiblePeaceful · 35 cm · Hard care · 24–29 °C (75–84 °F)
- Both are peaceful, and their water overlaps around 25–29 °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.
- Flowerhorn Cichlid✅ CompatibleAggressive · 30 cm · Medium care · 25–30 °C (77–86 °F)
- Compatible on the things that matter: shared water near 25–30 °C, workable temperaments, and no predator-and-prey size gap.
- Gold Nugget Pleco✅ CompatibleSemi-aggressive · 28 cm · Hard care · 24–29 °C (75–84 °F)
- Compatible on the things that matter: shared water near 25–29 °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.
- Kissing Gourami✅ CompatibleSemi-aggressive · 30 cm · Medium care · 22–28 °C (72–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Leopard Cactus Pleco✅ CompatibleSemi-aggressive · 30 cm · Hard care · 24–30 °C (75–86 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Mango Pleco✅ CompatibleSemi-aggressive · 28 cm · Hard care · 25–32 °C (77–90 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Mayan Cichlid✅ CompatibleAggressive · 28 cm · Medium care · 20–30 °C (68–86 °F)
- Peaceful + Aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Midas Cichlid✅ CompatibleAggressive · 35 cm · Hard care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 25–28 °C, workable temperaments, and no predator-and-prey size gap.
- Oscar✅ CompatibleAggressive · 35 cm · Medium care · 23–28 °C (73–82 °F)
- Peaceful + Aggressive, but with no direct clash here, and their water overlaps around 25–28 °C — no size, zone or temperament conflicts.
- Peacock Eel✅ CompatibleSemi-aggressive · 30 cm · Medium care · 22–28 °C (72–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 25–28 °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.
- Pearl Cichlid✅ CompatibleSemi-aggressive · 28 cm · Medium care · 22–28 °C (72–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Pearlscale Cichlid✅ CompatibleAggressive · 30 cm · Medium care · 22–28 °C (72–82 °F)
- Peaceful + Aggressive, but with no direct clash here, and their water overlaps around 25–28 °C — no size, zone or temperament conflicts.
- Ringtail Pike Cichlid✅ CompatibleAggressive · 28 cm · Hard care · 25–30 °C (77–86 °F)
- Compatible on the things that matter: shared water near 25–30 °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.
- Silver Cichlid✅ CompatibleSemi-aggressive · 30 cm · Medium care · 24–28 °C (75–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Spotted Pleco✅ CompatibleSemi-aggressive · 30 cm · Easy care · 18–26 °C (64–79 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 25–26 °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.
- Texas Cichlid✅ CompatibleAggressive · 33 cm · Medium care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 25–26 °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.
- True Parrot Cichlid✅ CompatibleSemi-aggressive · 33 cm · Hard care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 25–28 °C, workable temperaments, and no predator-and-prey size gap.
- Yellow-spotted Pleco✅ CompatiblePeaceful · 35 cm · Medium care · 24–27 °C (75–81 °F)
- Both are peaceful, and their water overlaps around 25–27 °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.
- Black Belt Cichlid⚠️ With cautionAggressive · 35 cm · Hard care · 24–30 °C (75–86 °F)
- Your 400 L tank is below the ~450 L this pairing really wants — crowding raises aggression.
- Butter Catfish⚠️ With cautionSemi-aggressive · 45 cm · Medium care · 24–28 °C (75–82 °F)
- Your 400 L tank is below the ~680 L this pairing really wants — crowding raises aggression.
- Electric Blue Acara⚠️ With cautionSemi-aggressive · 16 cm · Medium care · 22–28 °C (72–82 °F)
- Clown Loach may hunt Electric Blue Acara, fry or shrimplets — safest in a heavily planted tank.
- Electric Blue Hap⚠️ With cautionSemi-aggressive · 20 cm · Medium care · 24–28 °C (75–82 °F)
- pH preferences only just meet (Clown Loach 5–7.5 vs Electric Blue Hap 7.8–8.5) — target the overlap and acclimate slowly.
- Fahaka Puffer⚠️ With cautionAggressive · 45 cm · Hard care · 24–26 °C (75–79 °F)
- Your 400 L tank is below the ~450 L this pairing really wants — crowding raises aggression.
- Gold Zebra Catfish⚠️ With cautionAggressive · 55 cm · Hard care · 23–27 °C (73–81 °F)
- Clown Loach is small enough to tempt Gold Zebra Catfish; only risk it in a densely planted setup with hiding spots.
- Your 400 L tank is below the ~500 L this pairing really wants — crowding raises aggression.
- Jaguar Cichlid⚠️ With cautionAggressive · 55 cm · Hard care · 25–30 °C (77–86 °F)
- Watch for Jaguar Cichlid picking off any clown loach small enough to fit in its mouth.
- Lima Shovelnose Catfish⚠️ With cautionSemi-aggressive · 50 cm · Hard care · 23–30 °C (73–86 °F)
- Watch for Lima Shovelnose Catfish picking off any clown loach small enough to fit in its mouth.
- Your 400 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
- Malawi Trout Cichlid⚠️ With cautionAggressive · 35 cm · Hard care · 24–28 °C (75–82 °F)
- Different pH ranges (5–7.5 vs 7.8–8.6); doable if you sit in the shared band, but not ideal long-term.
- Your 400 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Orinoco Sailfin Pleco⚠️ With cautionSemi-aggressive · 50 cm · Medium care · 22–28 °C (72–82 °F)
- Your 400 L tank is below the ~450 L this pairing really wants — crowding raises aggression.
- Spotted Shovelnose Catfish⚠️ With cautionSemi-aggressive · 55 cm · Hard care · 22–28 °C (72–82 °F)
- Watch for Spotted Shovelnose Catfish picking off any clown loach small enough to fit in its mouth.
- Your 400 L tank is below the ~570 L this pairing really wants — crowding raises aggression.
- Sunshine Pleco⚠️ With cautionSemi-aggressive · 30 cm · Hard care · 23–29 °C (73–84 °F)
- Your 400 L tank is below the ~473 L this pairing really wants — crowding raises aggression.
- True Red Terror Cichlid⚠️ With cautionAggressive · 35 cm · Hard care · 22–28 °C (72–82 °F)
- Your 400 L tank is below the ~570 L this pairing really wants — crowding raises aggression.
- Venustus Cichlid⚠️ With cautionAggressive · 25 cm · Medium care · 24–28 °C (75–82 °F)
- pH preferences only just meet (Clown Loach 5–7.5 vs Venustus Cichlid 7.8–8.5) — target the overlap and acclimate slowly.
- Walking Catfish⚠️ With cautionAggressive · 50 cm · Medium care · 20–28 °C (68–82 °F)
- Clown Loach is small enough to tempt Walking Catfish; only risk it in a densely planted setup with hiding spots.
- Yellowjacket Cichlid⚠️ With cautionAggressive · 35 cm · Hard care · 24–28 °C (75–82 °F)
- Your 400 L tank is below the ~450 L this pairing really wants — crowding raises aggression.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Size gap is too large (250 vs 30 cm): Alligator Gar will treat Clown Loach as food.
- Your 400 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)
- Size gap is too large (90 vs 30 cm): Clown Knifefish will treat Clown Loach as food.
- Your 400 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 30 cm): Fire Eel will treat Clown Loach as food.
- Imperial Flower Loach⛔ Not recommendedSemi-aggressive · 50 cm · Hard care · 15–22 °C (59–72 °F)
- Temperature needs don't overlap (Clown Loach 25–30 °C vs Imperial Flower Loach 15–22 °C).
- Clown Loach is small enough to tempt Imperial Flower Loach; only risk it in a densely planted setup with hiding spots.
- Your 400 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Clown Loach is bite-sized to a 90 cm koi — it will be eaten.
- Your 400 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)
- Clown Loach is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
- Your 400 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)
- Size gap is too large (90 vs 30 cm): Spotted Gar will treat Clown Loach as food.
- Your 400 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)
- Size gap is too large (300 vs 30 cm): Wels Catfish will treat Clown Loach as food.
- Your 400 L tank is below the ~20000 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.
Clown Loach care specs
- Care level
- Medium
- Breeding
- Very Hard
- Max size
- 30 cm (11.8 in)
- Min tank size
- 400 L (105.7 gal)
- Temperature
- 25–30 °C (77–86 °F)
- pH
- 5–7.5
- Hardness
- 2–12 dGH
- Lifespan
- 10–25 years
- Diet
- Omnivore
- Swim level
- Bottom
- Group size
- 5+ (shoaling)
- Family
- Botiidae
- Origin
- Southeast Asia — fast-moving rivers of Borneo and Sumatra
What is a Clown Loach?
The clown loach (Chromobotia macracanthus) is one of the most striking and characterful bottom-dwellers in the freshwater hobby. Its vivid orange body, punctuated by three bold black wedge-shaped bands and red-tipped paired fins, makes it unmistakeable — but the real draw is its personality. Clown loaches are social, curious and entertaining; they interact with their keepers and with each other in ways few other loaches match.
They are also one of the most misrepresented fish in the hobby. Juveniles are typically sold at 5–8 cm (2–3 in), encouraging buyers to underestimate the tank space and time commitment involved. A well-cared-for clown loach reaches 30 cm (12 in) and can live 20 years or more. Plan for the adult, not the juvenile.
Where do Clown Loaches come from?
Clown loaches are native to Borneo and Sumatra in Southeast Asia, where they inhabit fast-moving rivers and streams with clean, warm, oxygen-rich water. Their natural environment has a soft, slightly acidic character — tannin-stained water over sand and leaf litter, shaded by dense riparian vegetation. During seasonal floods they move into flooded forests to feed and, it is believed, to spawn.
This origin shapes every aspect of their care: they need warm, well-oxygenated water, moderate current, and a substrate they can nose through — a long way from a stagnant, low-flow tank with coarse gravel.
What size tank does a Clown Loach need?
The honest answer for a group of five adult clown loaches is 400 litres (about 105 gallons) at minimum, with a tank footprint of at least 150–180 cm (59–71 in) in length. That is the space adults of 25–30 cm (10–12 in) actually need to turn around, establish social hierarchies, and swim normally.
Because juveniles grow slowly — a few centimetres per year — many keepers start with a smaller grow-out tank and upgrade as the fish develop. That is a reasonable approach, but the upgrade must be planned in advance, not improvised. A group that has been cramped for years will be stunted and more disease-prone.
The tank should have good filtration with moderate current, a fine sand or smooth-gravel substrate (clown loaches are enthusiastic diggers), and a generous supply of caves, driftwood and hides. Subdued lighting suits them; floating plants or dense planting will encourage them to venture into the open.
What water parameters do Clown Loaches need?
- Temperature: 25–30 °C (77–86 °F). Clown loaches prefer the warmer end of the tropical range; temperatures toward 28–30 °C (82–86 °F) support their immune system and activity level.
- pH: 5.0–7.5, ideally 6.0–7.0 for long-term maintenance.
- Hardness: 2–12 dGH — soft to moderately hard.
High oxygen levels matter more for clown loaches than for many other tropical fish. Surface agitation, a spray bar or gentle powerhead circulation are all worthwhile. Weekly water changes of 25–30 % help maintain the water quality this species demands. Clown loaches are notably sensitive to ammonia and nitrite; a fully cycled tank with reliable filtration is not optional.
What do Clown Loaches eat?
Clown loaches are omnivores with a strong preference for meaty foods and a well-documented enthusiasm for live snails. A good staple diet combines high-quality sinking pellets or wafers with regular offerings of frozen or live bloodworms, daphnia, brine shrimp and earthworms. Blanched vegetables — zucchini, cucumber, spinach — are accepted and provide useful dietary variety.
Their snail-hunting ability is genuine and useful: a group will systematically clear a tank of pest bladder or ramshorn snails, detecting and digging them out of the substrate. Providing live snails as an occasional treat is great enrichment.
Feed sinking foods in the evening when clown loaches are most active, and remove leftovers to avoid fouling the substrate.
Are Clown Loaches aggressive — and what fish can live with them?
Clown loaches are peaceful toward other species and make excellent residents in a large community tank. Their social aggression is limited to squabbles within the group itself — the species establishes a hierarchy, and occasional chasing or mock-fighting between individuals is normal group behaviour, not cause for alarm.
They should always be kept in groups of five or more. Fewer than five results in chronic stress: shy, reclusive fish that hide constantly and fail to thrive. A group of six to eight is even better, and larger groups tend to be bolder and more active in the open.
Good tank-mates are mid- and upper-water species of comparable size that won’t nip fins or outcompete for food: larger tetras, rasboras, gouramis, angelfish and silver dollars all work well. Avoid aggressive cichlids and very small fish that could become prey as the loaches grow.
For a full list of compatible and incompatible pairings, see Clown Loach tank mates.
How do you tell male and female Clown Loaches apart?
Sexing clown loaches is genuinely difficult, particularly in juveniles — it is essentially impossible in fish under 10–12 cm. In adults, females are typically noticeably fuller and rounder in the body when gravid with eggs. Males may have a slightly hooked or curved tip to the tail fin, though this is a subtle and inconsistent marker. Neither characteristic is reliable on its own, which is part of why captive breeding is so rarely achieved: identifying a true pair is half the challenge.
How do Clown Loaches breed?
Clown loach breeding in home aquaria is rated very hard and is achieved only rarely. In the wild they are seasonal, migratory spawners that flood into forest shallows during the rainy season — conditions nearly impossible to replicate at home. Commercial breeding uses large outdoor ponds and hormone injections to trigger spawning.
The rare home successes involve very large tanks, significant temperature and water-chemistry manipulation to simulate a wet-season trigger, and intensive conditioning on live foods. Eggs are small and numerous; parents will eat them if given the chance. For most keepers, clown loaches are a species to appreciate rather than breed.
What are common Clown Loach diseases?
Clown loaches have one significant and well-known vulnerability: they are extremely susceptible to ich (Ichthyophthirius multifiliis, white spot disease). They appear to contract it more readily than most fish and develop symptoms faster. They are also particularly sensitive to many of the treatments used against ich, especially at standard doses — their scaleless or nearly scaleless skin absorbs medications differently than scaled fish. Quarantining all new fish before they meet your loaches is essential practice.
Beyond ich, the main health concerns are:
- Skinny disease (internal parasites, often Camallanus worms) — fish waste away despite eating.
- Bacterial infections — usually secondary to poor water quality or injury.
- Bloat / dropsy — abdominal swelling linked to water quality issues or diet.
Prevention is straightforward in principle: pristine water conditions, a fully cycled tank, quarantine for new arrivals, and stable warm temperatures. Clown loaches kept at 28–30 °C (82–86 °F) with regular water changes and good filtration rarely get sick.
Health note: disease diagnosis and medication selection are beyond the scope of a care profile. If your clown loaches show symptoms of illness, confirm the diagnosis against a reputable veterinary or fish-health source before treating — and research any medication’s suitability for scaleless fish before use.
How long do Clown Loaches live?
With proper care, clown loaches are exceptionally long-lived — a lifespan of 10–25 years is realistic, and fish in large, well-maintained systems occasionally exceed that. A group bought today could still be with you in twenty years, growing steadily and requiring an ever-larger tank.
Commit to the full picture: a species-appropriate tank of 400 L or more, a group of five or more, warm and well-oxygenated water, and consistent maintenance. Give them that, and they will repay it with bold personalities and a lifespan that makes them genuine long-term companions.
Frequently asked questions
How big do clown loaches really get, and how fast?
Given good care, clown loaches reach 25–30 cm over many years — they are slow growers, adding only a few centimetres per year. A fish sold at 5 cm in a pet shop can take a decade to hit full size, so plan for the adult, not the juvenile. That adult needs a large footprint tank — at least 180 cm long — with five or more companions.
Why do my clown loaches lie on their sides?
Clown loaches routinely rest on their sides or wedge themselves into tight spots, which alarms new keepers. This is completely normal resting behaviour, not illness. However, they are unusually sensitive to ich (white spot) and poor water quality, so keep up with regular water changes and maintain temperature in the upper end of their range.
What you need to keep a clown loach
The baseline is a heated, filtered 400 L+ tank: a reliable heater to hold 25–30 °C (77–86 °F), a gentle filter that won't batter a clown loach in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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