[MoribundMaverick]

Changing shells is fine =]

I had a crab that constantly changed between EVERY shell that was her size! My room mate would joke around and say that she learned from me- she could never decide what clothes she wanted to wear. =P

I don't know why they do that... I've also heard that they change shells depending on the thickness. Like if it's warm one day they might change into a thinner shell, and then when it cools back off they'll switch back into their thicker shell. I don't know if that's true, though.