The clown loach is one of the most characterful fish you can keep. Bold orange and black bands, a habit of clicking at feeding time and a tendency to lie on their sides as if they have died have made them a long-running favourite. They are also one of the most misunderstood fish in the hobby. A clown loach bought at 5 cm can grow to 20 cm or more and live for decades. This guide explains what they really need, so you can plan for the fish they will become, not the one you bring home.
Clown Loach at a Glance
| Scientific name | Chromobotia macracanthus |
| Adult size | Usually 15 to 20 cm in aquariums, up to 30 cm |
| Lifespan | 15 to 20 years, sometimes more |
| Minimum tank (adults) | 300 litres, 150 cm long |
| Temperature | 25 to 30°C, ideally 26 to 28°C |
| pH | 6.0 to 7.5 |
| Group size | At least 5 |
| Temperament | Peaceful, social, active |
| Diet | Omnivore, bottom feeder |
Where Clown Loaches Come From
Clown loaches are native to the rivers of Borneo and Sumatra in Indonesia. They live in clear, warm, flowing water for most of the year and migrate into flooded areas during the rainy season to spawn. That background explains a lot about their needs: warm, well-oxygenated water, some current, and plenty of room to move as a group.
How Big Do Clown Loaches Get?
This is the most important thing to know before you buy. Clown loaches are usually sold at 5 to 8 cm, but they keep growing. Growth is slow, often 2 to 3 cm a year once they pass the juvenile stage, so it can take many years to reach full size. Healthy adults in a good-sized tank commonly reach 15 to 20 cm, and in very large aquariums some reach 25 to 30 cm.
That means a clown loach is a long-term commitment. Plan for the tank they will need in five years, not just the one you have today.
Tank Size and Setup
A small group of juveniles can start in a tank of around 200 litres and 120 cm long, but adults need at least 300 litres and 150 cm of length. Because they live in groups, the tank needs to be sized for five or more fish, not one.
A good clown loach tank includes:
- Soft sand. They forage with their sensitive barbels and dig constantly. Sharp gravel can damage barbels and skin.
- Caves and hiding places. Rock caves, pipes and driftwood tangles give each loach a spot to retreat to. They love squeezing into tight gaps, so make sure every cave has an exit they cannot get stuck in.
- Strong filtration and flow. They are big, messy eaters from flowing rivers. Use a filter rated well above the tank volume and add a powerhead for extra current and oxygen.
- A tight lid. Clown loaches can jump, particularly when startled.
- Hardy plants. Anubias, java fern and sturdy swords cope well. Delicate rooted plants tend to get dug up.
Water Parameters
- Temperature: 26 to 28°C is ideal. They need warmer water than many community fish, which limits some tank mate choices.
- pH: 6.0 to 7.5.
- Hardness: Soft to moderately hard.
- Ammonia and nitrite: Always zero. Clown loaches are sensitive to poor water quality.
- Nitrate: Below 20 ppm. Weekly water changes of 25 to 30 percent are important for a heavily stocked loach tank.
Only add clown loaches to a mature, fully cycled tank with stable parameters.
Why Clown Loaches Need a Group
Clown loaches are intensely social. Kept alone or in a pair, they become shy, stressed and often stop eating. In a group of five or more, they settle a clear pecking order, play, chase, and spend much of the day out in the open. You will hear them too: clown loaches make audible clicking sounds, especially when feeding or squabbling.
Do not be alarmed if you see one lying on its side or upside down on the substrate or wedged in a cave. This is normal resting behaviour. A loach that is gasping, has clamped fins or is not responding to food is a different matter.
Best Tank Mates for Clown Loaches
Clown loaches are peaceful but active and grow large, so tank mates should be robust, fast enough to cope with the commotion and happy at 26 to 28°C:
- Larger tetras, such as congo tetras and black widow tetras
- Peaceful barbs, such as cherry barbs and gold barbs, and active barbs like tiger barbs in a large tank
- Rainbowfish
- Larger rasboras and danios
- Peaceful gouramis
- Bristlenose plecos and other robust catfish
- Other loaches, such as yoyo loaches
Avoid very slow, long-finned fish and anything small enough to be outcompeted at feeding time. Clown loaches will eat snails, so ornamental snails are not a good mix. Shrimp will also usually be eaten. For other loach species that share their needs, see our guide to types of loaches; the yoyo loach in particular makes a good companion.
What to Feed Clown Loaches
Clown loaches are omnivores that feed mainly from the bottom. A varied diet keeps them healthy and well coloured:
- Staple: quality sinking pellets or wafers, sized for their mouths.
- Frozen foods: bloodworm, brine shrimp, mysis and chopped prawn several times a week.
- Vegetables: blanched courgette, cucumber and peas.
- Snails: they are famous for eating pest snails, which is a useful bonus but should not be their only food.
Feed once or twice a day. Make sure food reaches the bottom, as faster fish can take it before the loaches arrive. Feeding just after lights out works well, as they are most active at dusk. Our range of aquarium fish food includes suitable sinking foods and frozen treats.
Clown Loaches and Snail Control
Many people buy clown loaches to tackle a pest snail outbreak, and they are effective. But given their adult size and lifespan, buying them purely as snail control is rarely a good idea. If snails are the problem, start with gentler methods; our guide to getting rid of pond snails without chemicals covers the options.
Common Health Problems
White spot
Clown loaches are well known for being among the first fish to catch white spot, so much so that they are sometimes called an early warning system. Their very small, embedded scales leave their skin more exposed to the parasite. Watch for white dots, scratching against objects and clamped fins, especially after new fish are added or the temperature drops.
Sensitivity to medication
Like other loaches, clowns are sensitive to many medications, particularly those containing copper, formalin or malachite green. Always read the label, use products marked as safe for scaleless fish where available, and consider half doses. Raising the temperature slightly and increasing aeration can help during treatment.
Skinny disease and wasting
Newly imported loaches sometimes arrive with internal parasites and lose weight despite eating. Quarantining new arrivals and feeding well helps you spot this early.
Can You Breed Clown Loaches?
Practically, no. Clown loaches almost never spawn in home aquariums, as they need very large spaces and seasonal migration cues. Most sold today are bred commercially in Indonesia using hormone-induced spawning, or collected from the wild.
Buying and Acclimatising Clown Loaches
Choose active, round-bellied fish with clear eyes, clean fins and strong colour. Avoid any with white spots or a sunken belly. Buy a group at once if you can, so they settle together. Acclimatise slowly with the drip method, keep the lights low for the first day, and quarantine where possible, given their susceptibility to white spot.
You can find our clown loaches in the loach category, delivered by tracked courier in insulated packaging.
Frequently Asked Questions
How many clown loaches should be kept together?
At least five. Larger groups are more confident and show more natural behaviour.
Why is my clown loach lying on its side?
It is usually resting. Clown loaches often sleep on their sides or wedged in caves. Check for other signs of illness before worrying.
Do clown loaches eat snails?
Yes, they eat most snails, including pest snails. They are not compatible with ornamental snails you want to keep.
Are clown loaches good for beginners?
They are hardy once settled, but their adult size, lifespan and sensitivity to white spot make them better suited to keepers with a large, mature tank.
How fast do clown loaches grow?
Fairly quickly as juveniles, then slowly, often 2 to 3 cm a year. Reaching full size can take many years.
Plan for their full size, keep them in a proper group and give them warm, clean, flowing water, and clown loaches will be one of the most entertaining fish you ever keep, for a very long time.