what's dismembering my crabs?

[arowanaman420]

I have a 42g hex w/ 2 false percs, lawnmower blenny, twin spot goby, bangaii cardinal, cleaner shrimp, emerald crab, sally lightfoot, and some snails and hermits. I recently noticed my emerald crab was down to 4 legs, 3 on one side and 1 on the other. Last night I noticed my sally lightfoot missing a pincher arm. My top suspects are the hairy, black-tip clawed hitchhiker crabs. I have removed 2 already as I've heard they're bad news anyway. I think there's only 1 left. Are these the likely suspects or is something else attacking my crabs?

 

[melosu58]

Either that or the sally light foot and emerald are doing it to each other.

 

[DragonForce]

If you get anymore of those crabs ship them to me! I need something to battle my peacock mantis.