What size tank do assassin snails need?
At least 5 gallons (19 liters). The smallest standard tank that works is the 5 gallon. A bigger tank is always easier to keep stable. Scientific name: Anentome helena.
How many assassin snails in each tank size?
This is how many each standard tank carries comfortably if assassin snails are the only animals in it. Share the tank with other species and the number goes down.
| Tank | How many assassin snails |
|---|---|
| 5 gallon | up to 2 |
| 10 gallon | up to 3 |
| 20 gallon long | up to 7 |
| 29 gallon | up to 11 |
| 40 gallon breeder | up to 15 |
| 55 gallon | up to 21 |
| 75 gallon | up to 29 |
| 125 gallon | up to 49 |
Check assassin snails against your own tank and other fish
Good to know
- Eats other snails, so do not keep it with snails you like.
Tank mates for assassin snails
These animals like the same water, are a safe size, and have a temper that fits. It is a match on paper: always watch new tankmates for the first week.
- Endler's livebearer
- Guppy
- Ember tetra
- Lambchop rasbora
- Glowlight tetra
- Black neon tetra
- Harlequin rasbora
- Honey gourami
Poor matches
- Angelfish: Angelfish (about 6 in) can eat assassin snail (about 1 in).
- Fancy goldfish: Goldfish do best with other fancy goldfish.
- Oscar: Oscar is aggressive and will bully or kill peaceful fish such as assassin snail.
- Molly: Molly (about 4 in) can eat assassin snail (about 1 in).
Questions and answers
What size tank do assassin snails need?
At least 5 gallons (19 liters). The smallest standard tank that works is the 5 gallon. A bigger tank is always easier to keep stable.
How many assassin snails should be kept together?
One is fine. An assassin snail does not need company, though a large enough tank can hold more than one.
Can assassin snails live in a 10 gallon tank?
Yes. A 10 gallon tank carries up to about 3 as the only animals in the tank.
What temperature do assassin snails need?
73–81 °F (23–27 °C), with a pH of 7–8. In most homes that means a heater.
Can assassin snails live with a betta?
Usually, yes, in a tank of 10 gallons (38 liters) or more. They like the same water: 75–81 °F (24–27 °C). Every betta has its own temper, so watch closely for the first week and have a spare tank ready.
More fish
Adult size, tank size and water ranges follow the mainstream care consensus (Seriously Fish species profiles and FishBase maximum lengths). Where sources differ we use the more cautious figure. Stocking numbers come from our stocking calculator.