Assassin Snail tank mates
A snail you hire rather than keep. Two or three grind a pest-snail plague down to nothing inside a couple of months — then the job is done, and the tank needs a plan for the workers.
Common mistakeAdding assassin snails to a display that already has nerites, and leaving them after the bladder snails are gone, is how keepers lose the valued snails next. Assassins do not clock out when the pest job ends. Remove them after clean-up, or accept risk to ornamental snails and shrimplets. The mistake is treating a predator as a temporary filter you can forget.
Each name below opens a pair check with Assassin Snail. That check is the decision, not the list itself.
Usually safer companions
Conservative shortlist from this profile. Open a pair page before you buy.
The Assassin Snail profile lists Cherry Barb as both safe and a recommended pairing. Cherry Barb schools in groups of 6 or more, so plan room for the whole group rather than one fish. Cherry Barb grows bigger than Assassin Snail (5cm vs 2.5cm). Stock the Assassin Snail group large enough to outnumber the Cherry Barb, or the smaller fish ends up bullied or off food. Cherry Barb swims in the middle zone while Assassin Snail stays in the bottom, so the two will not crowd the same water column.
The Assassin Snail profile lists Harlequin Rasbora as both safe and a recommended pairing. Harlequin Rasbora schools in groups of 6 or more, so plan room for the whole group rather than one fish. Harlequin Rasbora grows bigger than Assassin Snail (5cm vs 2.5cm). Stock the Assassin Snail group large enough to outnumber the Harlequin Rasbora, or the smaller fish ends up bullied or off food. Harlequin Rasbora swims in the middle zone while Assassin Snail stays in the bottom, so the two will not crowd the same water column.
Risky or situational
May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Fish to avoid with Assassin Snail
Predation, aggression, or space rules on this profile. Treat these as poor default mixes.
Mystery Snail conflicts with Assassin Snail on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Nerite Snail conflicts with Assassin Snail on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Tank size and groups
- Published minimum for Assassin Snail: 30L. Group minimum 1 .
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 30L hub.
Plan before you buy
Start a pair check with Assassin Snail, or open a starter plan with the top safer companions in the builder.
Tank hubs: 30L
Related reading
Guides that list other fish with the same trait, so you can plan around the group rather than one row.
- Fish that eat smaller tank mates →
Assassin Snail may eat anything that fits in its mouth as it grows.
- Peaceful community fish →
Other peaceful species to shortlist beside Assassin Snail.
- Fish for smaller tanks →
Assassin Snail fits the small-tank filter — check volume hubs before you buy.
Filtration & heating
A 30L minimum tank for Assassin Snail needs a filter rated for at least 120L/hr turnover and a heater maintaining 20–28°C.
Similar fish (same category)
- Blue Dream Shrimp · min 20L
- Ghost Shrimp · min 40L
- Malaysian Trumpet Snail · min 20L
- Bamboo Shrimp · min 80L
Related (care + temperament)
Featured compatibility checks
Curated pair pages for Assassin Snail. Each opens a full verdict — not just a list label.
Assassin Snail tank mates — quick answers
- What fish can live with Assassin Snail?
- Usually safer companions on this hub include Cherry Barb, Harlequin Rasbora. Open each pair check before you buy — the list is a shortlist, not a guarantee.
- What tank mates should you avoid with Assassin Snail?
- Avoid Mystery Snail, Nerite Snail based on size, temperament, or predation risk on this profile.
- What size tank do Assassin Snail need for a community?
- 30L is the planning floor for adult swimming space and bioload. A 40L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.