Redtail Loach
Cobitoidea sp.
The Redtail Loach (Cobitoidea sp.) is a peaceful fish that's a good step up once you have a little experience. Give it a tank of at least 285 litres (75 US gallons), water held at 73-82°F, and a pH of 6-7.8.
Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
Asia
- East & Southeast Asia
Regional colours match the stocking calculator's origin map.
Redtail Loach Tank Setup
Give them at least 285 litres (75 US gallons) and a tight-fitting lid, since many loaches are escape artists. Keep the water at 73-82°F with a pH around 6-7.8; soft sand suits the ones that like to burrow. They grow to around 25 cm, so plan the tank size and filtration for a full-grown adult rather than the small juvenile you see in the shop.
What Do Redtail Loaches Eat?
They're not fussy eaters - feed a varied diet, rotating good-quality dry, frozen, and gel foods rather than the same thing every day, and match the food size to their mouths.
Redtail Loach Tank Mates
Requires a large tank and good filtration. The Redtail Loach is peaceful, which is the first thing to weigh up when you choose tank mates. At around 25 cm fully grown, it needs tank mates that can hold their own against its size and appetite. Before you buy, run your full stocking list through our stocking calculator. It weighs temperament, adult size, and water needs together, which a single species page can't do on its own.
Are Redtail Loaches Good for Beginners?
Doable once you test water regularly and catch problems before fish look sick. If this is your first tank, pick something more forgiving and come back later.
Redtail Loach - frequently asked questions
What size tank do Redtail Loaches need?
Redtail Loaches need a tank of at least 285 litres (75 US gallons). A bigger tank is always easier to keep stable, and gives them more room to settle in and behave naturally.
What water parameters do Redtail Loaches need?
Keep them at 73-82°F with a pH of 6-7.8, steady rather than chased to an exact figure. In a cycled tank, ammonia and nitrite should both read 0 ppm, with nitrate kept low through regular water changes.
What do Redtail Loaches eat?
Redtail Loaches are omnivores and aren't fussy eaters. Feed a varied mix of good-quality dry, frozen, and gel foods, and match the food size to their mouths. Feed small amounts once or twice a day, and remove anything they don't eat.
Are Redtail Loaches good for beginners?
Redtail Loaches are best for keepers with a little experience. They are manageable once you test water regularly and catch problems early; a complete beginner may prefer something more forgiving first.
Common mistakes with Redtail Loaches
- Underestimating tank size - the minimum footprint is 285 litres (75 US gallons); impulse buying into a smaller tank leads to stress and shortened lifespan.
Building a community? Run the full list through the stocking calculator before you add anything else.
Great tank mates
Chosen from temperament, overlapping temperature/pH bands, plausible minimum tank footprints, and size versus yours in App-aquatic data. Hobby nuance always wins - verify stocking and temperament before purchasing.
Fish to avoid mixing with Redtail Loaches
These well-known species are commonly sold alongside this fish but are not recommended tank mates - verify before purchasing.
- OscarPredator - Oscar will eat or injure smaller tank mates
- Pea PufferPredator - Pea Puffer will eat or injure smaller tank mates
- Betta (Male)Predator - Betta (Male) will eat or injure smaller tank mates
