I have one in my big tank (150 gallon) since May 04 and just two weeks ago i transferred it to a 54 cube tank. It is a small white one and it changed shell only once. It digs a lot and hide under sand but fortunately it didn't grow that much. I got it at 1.25" and it is close to 1.5" right now. Grows pretty slow. It is a pretty good survivor, been thru a lot. Doesn't harm anything.
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