Does fiddler crabs need sand or rocks? Do they need air and water? What do I feed them? can they live with fish? Will they eat the fish? Is a 2.5 gallon tank too small for them to live and breed in? Please tell me a appropriate tank size for them to live in. Would they breed also if they live with fish? Do they need sand to breed and dig caves,Or can they do that in rocks? Last, Do I need to cycle the tank before adding fiddler crabs? I would like to know about all of these answers and also you can tell me some more information if I have not listed it above. Please help. Thanks