Crabs?

[Nano_reefer_101]

What kind of crab can go into a 13.5 gallon tank with two clowns and a yellow spotted goby and a torch coral

 

[Retro Reefer]

Just about any of the hermits would be a good choice and they are also good CUC members for your tank. a small emerald would also be ok but if there isn’t enough for it to eat it may pick on corals.