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So I got this blue crayfish a while back and now I've noticed that he's staying in his cave more often and that he started digging a hole and using th rocks to plug up the entrence. The first time he molted he didn't do this but I thought this was normal and that he was going to molt soon. well...

So I was thinking about getting some fiddler crabs for my ten gallon tank and I was just wondering if anyone could give me some info. I already know that they need brackish water and a beach or something. I would like to know more, like how many can i have. I've also seen different species and...