yep!, they are really peaceful, give them a few spare shells too.I just came across this post and have the same question as the OP. I just got a pom pom crab hoping he'd do some cleanup in my tank (detritus) but he's turned out to be a bit of a diva and wants me to target feed him. Now instead of him cleaning up leftover food I'm adding more food to the tank for him. Haha. Anyway, now I'm looking for a different crab and came across the dwarf blue legged crab (Clibanarius tricolor). Is this the same one everyone is discussing here? If so do they stay small? My tank is a 5g so they need to stay small. Also, are they fine with other crabs? I don't want my pom pom put in jeopardy.