Hi all, I have aabout a dozen or so crabs in my tank they have been there since I set up 5 mnths ago, I have noticed that one has become quite large maybe 2 inches from leg to leg , they appear to be standard brownish hairy crabs , is the size of this guy going to be a problem, also my BTA has been looking off color lately today he moved to a new position and where he previously was there appears to be a small 20 cent size piece of like marshmallow, is this possably a split by him/her