Crabs Care Guides
Aquarium and paludarium crabs - most need land and brackish water, with a few fully aquatic exceptions.
Thai Micro Crab
Limnopilos naiyanetri
A tiny, fully aquatic, completely peaceful crab that is safe with shrimp and nano fish.
Vampire Crab
Geosesarma dennerle
A purple-and-orange semi-terrestrial crab that needs a paludarium, not a fish tank - and no salt water at any stage.
Red Claw Crab
Perisesarma bidens
A feisty brackish crab that needs salt and a land area to climb out onto.
Fiddler Crab
Austruca/Uca sp.
A charming brackish crab whose males wave one giant claw; needs land and salt.
Blue Leg Hermit Crab
Clibanarius tricolor
A tiny, peaceful hermit that eats algae and detritus; provide spare shells to reduce squabbles.
Scarlet Hermit Crab
Paguristes cadenati
A bright-red reef-safe hermit that grazes hair and film algae.
Halloween Hermit Crab
Ciliopagurus strigatus
A striking orange-banded algae-eating hermit; mostly reef-safe but provide shells.
Emerald Crab
Mithraculus sculptus
A green crab that eats bubble algae and detritus; mostly reef-safe but opportunistic if underfed.