My scarlet hermit crabs are being killed and I don't know who the culperit is. Can anyone help? All I have in my tank is 1 coral beauty and 3 damsels (55 gal.) plus turbo snails and blue hermits,1 coralbanded shrimp, 2 pepermint shrimp, 2 brittle stars, 2 serpent stars and 4 emerald crabs. Will any of these kill my scarlets? I would hate to buy more only to be feeding something else.Also I have 75lbs. of LR which was fully cured before placement in my tank. Any ideas would be apprieciated.