Great Ramshorn
Planorbarius corneus
The Great Ramshorn (Planorbarius corneus) is a peaceful fish that's rewarding to keep. Give it a tank of at least 20 litres (5 US gallons), water held at 64-77°F, and a pH of 6.5-7.5.
Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
North America
- Central America & Mexico
Regional colours match the stocking calculator's origin map.
Great Ramshorn Tank Setup
Give them at least 20 litres (5 US gallons). Cichlids are territorial and produce plenty of waste, so strong filtration and some rocks or wood to break up sight lines both help. Aim for 64-77°F and a pH around 6.5-7.5.
What Do Great Ramshorns 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.
Great Ramshorn Tank Mates
The Great Ramshorn is peaceful, which is the first thing to weigh up when you choose tank mates. Good matches come down to the whole stocking list working together - temperature, tank size, and temperament - not any single label. 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 Great Ramshorns Good for Beginners?
Care demand varies by line and setup. Match the care level to how often you actually test and change water.
Great Ramshorn - frequently asked questions
What size tank do Great Ramshorns need?
Great Ramshorns need a tank of at least 20 litres (5 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 Great Ramshorns need?
Keep them at 64-77°F with a pH of 6.5-7.5, 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 Great Ramshorns eat?
Great Ramshorns 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 Great Ramshorns good for beginners?
It depends on the setup. Match Great Ramshorns to how often you actually test water and perform maintenance.
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 Great Ramshorns
These well-known species are commonly sold alongside this fish but are not recommended tank mates - verify before purchasing.
- Pea PufferPredator - Pea Puffer will eat or injure smaller tank mates
- Plakat BettaPredator - Plakat Betta will eat or injure smaller tank mates
- Tiger BarbFin nipper - will shred the fins of peaceful fish
