Care Level: Extremely easy. Blue Legged Hermit crabs make a great beginner crab.
What do they eat? Leftover fish food, algae, decaying matter. They don’t need to be fed. They’ll eat whatever scraps the fish drop.
Who can they live with? Almost any tankmates are fine. They may bother some types of corals.
How much space do they need? Not much. They’ll do fine in a small nano tanks as small as 3 gallon.
How do they multiply? No
Any special needs? Leave larger empty shells in the tank. Crabs need to change into larger shells when the existing one is too small.
Life span: 2 years or more.