Thankz for your reply- How big does a worm have to be to cause damage? Some of the little critters are getting thumbnail size and looking...well, alien. Someone thought a crab might be the problem. I have 4 red leg crabs and one with yellow striped legs and a white claw. I thought it was a bumblebee snail until i noticed he was no snail, he was a crab. He was in my tank for about a week. Today at lunch i went to go pull him and noticed that this morning he left his bumblebee shell and took over a red leg's shell. The red leg lost a claw, some legs and his shell. The bully is out, but what shall i do about the red leg? Will he recover...Do you think white claw was the Xena eater? Xena will recover if no more additional damage is done, i hope. Regards, Tyson