So I'm having trouble finding which crabs can live together peacefully. I currently have 2 hermit crabs that are at about .25" each and a red burrowing crab that is about 1 inch. I added the hermits like two or three days ago but the red burrower doesn't seem to be able to find them or find interest in them. I'm wondering if I can get emerald green crabs and arrow crabs too. I don't want to put anybody in there that might die from attacks or anything. If necessary I could target feed. Any help would be appreciated.