I bought my daughters two crabs on vacation in North Carolina... they made it back to Mi but there not eating much..I went to the pet store and bought the 10 gallon tank, also the pet store used these little rocks in there tank so thats what I'm using. We have had them probably 6-7 weeks now and they seem ok, but is there somthing else I should do about trying to feed them?? how do I know they are healthy? I have the coral from the beach and I also bought the little hut am I doing everything right??