Assassin Snail tank mates
Clea helena
5 rated pairings from the Assassin Snail care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Assassin Snail needs at least 5 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.
Neon Tetra
Paracheirodon innesi
10 gal min · 1.5" adult · Peaceful
Small peaceful fish that occupy mid-water column; no predation risk and compatible temperature/pH ranges
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful algae-eaters with identical water requirements; both are small and non-aggressive
Good matches
3 · Compatible with normal care — watch space and numbers.
Red Cherry Shrimp
Neocaridina davidi
5 gal min · 1.2" adult · Peaceful
Peaceful shrimp that occupy different ecological niches; assassin snails may occasionally prey on shrimplets but generally coexist well
Amano Shrimp
Caridina multidentata
10 gal min · 2" adult · Peaceful
Larger shrimp species that are less vulnerable; compatible water parameters and peaceful temperament
Dwarf Gourami
Trichogaster lalius
15 gal min · 3.5" adult · Semi-aggressive
Peaceful, slow-moving fish that won't compete for food; similar water temperature preferences
Also recommended alongside Assassin Snail
Species whose own guides list Assassin Snail as a tank mate.
Bladder Snail
Physella acuta
5 gal min · 0.5" adult · Peaceful
Giant Ramshorn Snail
Marisa cornuarietis
10 gal min · 2" adult · Peaceful
Crested Puffer
Carinotetraodon lorteti
15 gal min · 2.5" adult · Aggressive
Electric Blue Crayfish
Procambarus alleni
20 gal min · 5.5" adult · Aggressive
Figure Eight Puffer
Dichotomyctere ocellatus
20 gal min · 3" adult · Aggressive
Green Spotted Puffer
Dichotomyctere nigroviridis
30 gal min · 6" adult · Aggressive
Panther Crab
Parathelphusa pantherina
20 gal min · 3" adult · Semi-aggressive
Yoyo Loach
Botia almorhae
20 gal min · 2.5" adult · Semi-aggressive
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.