Emerald Crab tank mates
Mithraculus sculptus
6 rated pairings from the Emerald Crab care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Emerald Crab needs at least 30 gallons on its own; every companion adds to that.
Excellent matches
1 · Same water, complementary zones, no conflict.
Good matches
3 · Compatible with normal care — watch space and numbers.Ocellaris Clownfish
Amphiprion ocellaris
20 gal min · 3.5" adult · Semi-aggressive
Active swimmers that generally avoid the crab's territory; compatible in reef setups
Royal Gramma
Gramma loreto
30 gal min · 3" adult · Semi-aggressive
Peaceful reef fish that occupies mid-water zones away from the crab
Firefish Goby
Nemateleotris magnifica
20 gal min · 3" adult · Peaceful
Peaceful, small fish that stays near the water column and is rarely bothered by emerald crabs
Use caution
2 · Works in the right setup; read the note before combining.Turbo Snail
Turbo fluctuosus
10 gal min · 2" adult · Peaceful
Larger snails are usually safe, but a hungry emerald crab may harass smaller or overturned individuals
Peppermint Shrimp
Lysmata wurdemanni
20 gal min · 2" adult · Peaceful
Can coexist but may be targeted by larger or aggressive emerald crabs, especially when molting
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.