Your tetras are settled in, and now you’d like a rabbit snail (Tylomelania sp.) grazing the rocks below them. Most tetras aren’t a good match: the snail needs warm, hard, alkaline water at 79-86°F (26-30°C) and pH 7.5-8.5, and the tetras usually suggested as tankmates are listed for cooler, softer or more acidic water. The tables below let you check your own fish against the snail’s numbers.

Which tetras can handle the water a rabbit snail needs?

None of the common community tetras fits the snail’s whole range, and the ember tetra comes closest on temperature. Start with the snail’s numbers, because they don’t bend for tankmates. The snail itself is a moderate keep. It’s the tank that asks more of you: warm, alkaline, mineral-rich and mature. Set it up the way Sulawesi rabbit snail care lays out before any fish goes in.

The water a rabbit snail tank needs
Temperature	79-86°F (26-30°C)
pH	7.5-8.5
GH	4-8 dGH
KH	3-6 dKH
TDS	150-250 ppm
Nitrate	Keep it under 10 ppm
Substrate	Inert sand or gravel, no active soil that lowers pH
Tank	Mature, with a visible film of algae and biofilm on rock and glass

Now hold each tetra up against that. FishBase, the scientific fish database, lists a temperature and water range for the tetras keepers ask about most. Here’s where each one meets the snail’s water.

Where common tetras meet rabbit snail water
Tetra	What FishBase lists	Overlap with the snail tank
Neon tetra (Paracheirodon innesi)	Very soft, acidic to neutral water; its warm end stops at the snail’s lowest temperature¹	Temperature touches the snail’s floor only; no pH overlap
Cardinal tetra (Paracheirodon axelrodi)	Acidic water; its warm end sits a degree or two Fahrenheit above the snail’s floor²	A narrow temperature overlap; no pH overlap
Serpae tetra (Hyphessobrycon eques, filed on FishBase as Megalamphodus eques)	Acidic to slightly alkaline water, harder than the snail’s GH band; its warm end stops at the snail’s floor³	A thin pH overlap at the snail’s low end; temperature touches the floor only
Black skirt tetra (Gymnocorymbus ternetzi)	Slightly acidic to slightly alkaline water; its warm end stops at the snail’s floor⁴	pH overlaps the lower half of the snail’s range; temperature touches the floor only
Ember tetra (Hyphessobrycon amandae)	Warm water, with no pH or hardness listed⁵	Temperature overlaps the snail’s lower end; water chemistry unknown

So what does that leave? For four of the five, a tank held at the very bottom of the snail’s temperature range, with the fish living at the very top of theirs. We wouldn’t build a tank where both animals live at the edge of what they’re known to handle. The ember tetra overlaps better on temperature. With no published pH or hardness range, though, there’s nothing to check its chemistry against, so we don’t recommend it either.

Why a middle-ground pH puts the rabbit snail’s shell at risk

Splitting the difference takes the snail out of its range, and the snail pays for it in its shell. Some guides suggest settling near neutral so each animal gets part of what it needs. It sounds fair, but it moves the water toward soft and acidic, which is exactly the direction that hurts snail shells.

Shell research from another family of snails points the same way.⁶ Nobody has measured the point where a rabbit snail’s shell starts to suffer, so the safe rule is to hold the range in the table and keep KH from drifting down. If your tap water starts soft, rabbit snails in soft water need that KH added back before anything else.

The same goes for the planted tanks tetras often live in. An active soil that pulls pH down suits soft-water fish and plants, and it’s the wrong base for this snail, which needs inert sand or gravel. If you see fresh erosion at the shell’s opening edge, where the snail is growing, test pH, GH and KH before you change anything else.

Do tetras nip at rabbit snail tentacles?

Some do, going by keeper reports. Rabbit snail owners describe tetras picking at the snail’s long, soft tentacles, and the reports name species already known as fin-nippers, such as Buenos Aires tetras.

Why does it matter if the snail survives the nipping? A rabbit snail feeds by grazing the film on rock and glass, and a snail that keeps pulling back into its shell isn’t out grazing. If you see fish following the snail or shortened tentacles, separate them. Nothing you add to the tank will reliably stop fish attacking rabbit snails, so separation is the fix.

If your rabbit snails already live with tetras, check these four things

Test the water first, because that decides everything else. Then work through the rest:

Water. Compare pH, GH, KH and temperature with the table above. Below pH 7.5 or 79°F (26°C), the snail is outside its range.
Tentacles. Watch for fish trailing the snail, tentacles that look shorter, or a snail that stays sealed in its shell for long stretches.
Food. Tetras reach sinking food long before a slow snail does. Drop food right beside the snail, and lift what’s left before it sits for hours in warm water.
Shell edge. Look at the opening of the shell for fresh, chalky wear, which points back to the water.

If the water is out of range, the fix is a separate tank for the fish. We know it’s tempting to nudge the chemistry until both animals sort of fit. Pushing a stocked tank’s water around is the riskier move, though, because fast shifts in pH and hardness stress everything in it.

What the research says about rabbit snails and tetras

The research says soft, acidic water costs a snail its shell and that Neocaridina can breed at the warm end of this tank, but both studies were done on other animals. Read them as direction, not as rabbit snail limits.

The shell work used the Florida apple snail (Pomacea paludosa), from another family. Animals kept in low-calcium, acidic water grew very little shell, and their shells showed erosion and broke more easily.⁶ It shows which way the risk runs when a tank drifts soft and acidic.

The Neocaridina figure comes from a 90-day study of red cherry shrimp at different temperatures. At 82°F (28°C) they grew, matured and bred.⁷ That’s one temperature in one study, so we’d still keep them to a small group here.

Sulawesi shrimp are the natural tankmate, because they need the same water. The question with them is grazing space: both graze the same film on rock and glass, so the tank needs enough mature surface for everyone. Start rabbit snails with Sulawesi shrimp small, one snail or a pair, and add more only while the film keeps up.

Neocaridina can work as a small group. They’re usually kept at 65-78°F (18-26°C), but they bred at 82°F (28°C) in a published study,⁷ and a small group lives and breeds in some of our own Sulawesi tanks at the snail’s temperature. Bee and Crystal shrimp want soft, acidic water and don’t fit. Assassin snails never belong in a rabbit snail tank, because they eat other snails. Guppies miss for a different reason: rabbit snails with guppies don’t share a hardness range at all.

If it’s tetras you want, give them their own soft-water tank and let the rabbit snail tank be the warm, hard one. Two tanks, two happy groups. Once the snail tank is running in the range above, with a visible film of algae and biofilm on the rock, you can choose from our Sulawesi snail lines. Every one is tank-bred by Shrimp Aquatics, and we don’t promise breeding, sex or the number of young from any order.