I just started my 55g, and I had 3 chromies and 1 hermit crab in there. Everything has been calm for a few days they hide behind the rocks at night and swim happily during the day. This afternoon I wake up late (long party last night) and I find one chromie missing! I figured he died or something, but I looked and looked and no body could be found! I turned over all the rocks, checked the overflow, checked the filter, checked around the tank incase he jumoed out. Nothing any ideas?