The male isnt separated. They can get in and out of the bowl whenever they like. The fiddlers need to be able to get out of the water now and then so I filled the bowl with gravel, lay it on its side and use an airline to pump it full of air and that gives them thier own little beach. They are the best scavengers that Ive ever seen. Left over food, dead plant leaves and algee are all kept in check.
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I'd have more aquariums but when I talk to my wife about it, she gives me the look!
Subject: My Fiddler Crabs 
