Ramshorn Snail
Planorbella duryi
Min Tank Size
19L
Adult Size
2.5 cm
Lifespan
1 year
About
Ramshorn snails have been hitchhiking into aquariums for decades, and depending on who you ask, that's either a blessing or a curse. Native to Florida and parts of the southeastern United States, Planorbella duryi is the selectively bred hobby variety behind the popular red, pink, blue, and leopard color forms you see for sale. The shell coils flat in a tight spiral, like a tiny ram's horn, which is exactly where the name comes from. They stay small, topping out around 2 to 2.5 cm, and their bodies range from deep burgundy to pale translucent depending on the color variety.
These snails are genuinely useful in a planted or community tank. They graze constantly on algae, biofilm, and decaying plant matter, doing quiet work that keeps a tank cleaner than it would be otherwise.
They don't demand much. Stable water, a pH above 7.0, and adequate hardness for shell building are the main requirements. Soft or acidic water is their enemy because it erodes the shell and causes pitting or cracking over time. Temperature tolerance is broad, which makes them compatible with most tropical setups.
The thing that catches people off guard is how fast they reproduce. They're hermaphrodites and don't need a mate to produce fertile eggs. Egg clutches appear on glass, hardscape, and leaves as small, jelly-like discs. In a tank with food and stable conditions, a single snail can seed a population in weeks. That population can either keep your tank spotless or become an annoyance, depending on how much food is available and whether someone is overfeeding. Controlled feeding keeps numbers manageable without chemical intervention.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Compatibility
Ramshorns work well with peaceful community fish, shrimp, and other snail species. Neocaridina and caridina shrimp coexist with them without issue, and the snails actually complement shrimp tanks by handling cleanup the shrimp don't. Avoid keeping them with pufferfish of any kind, including dwarfs, which actively hunt snails and crack shells. Most cichlids are a problem too, especially any species with a tendency to dig or mouth things on the substrate. Assassin snails are specifically sold to control pest snail populations and will target ramshorns directly. Bettas are sometimes fine and sometimes not, individual fish vary.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common mistake is letting the pH drift below 7.0. Shells start pitting and thinning, and the snails weaken before most people notice what's wrong. Calcium matters too. If your tap water is very soft, a cuttlebone piece or crushed coral in the filter helps. Overfeeding is the main driver of population explosions. Cut back on food and numbers stabilize naturally. Don't use any copper-based medications or algaecides in a tank with ramshorns, copper is lethal to all invertebrates at even low concentrations.
Behavior & Aggression
Ramshorn snails show zero aggression toward anything. They don't compete for territory, they don't bother fish or shrimp, and they ignore other snails entirely. If anything, they're on the receiving end of aggression from tankmates. Fish that nip or harass slow-moving animals, like certain cichlids, puffers, or even curious gouramis, will pick at their antennae or try to flip them. They have no defenses beyond pulling into their shell. Their biggest vulnerability isn't behavior, it's simply being edible.
Things to Know
- Reproduces without a mate via hermaphroditism, populations can explode quickly.
- Soft or acidic water dissolves shells, keep pH above 7.0 and GH stable.
- Assassin snails and most pufferfish will hunt and eat them.
- Reproduces very quickly, can overpopulate a tank.
- Population size is directly related to food availability.
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