From the size and shape of the claws I'd say you have a bad girl there! If you want to be sure check between its legs! Seriously, you look underneath where the tail and body come together. On the underside of the tail are little appendages called swimmerets. On a male the first pair are longer and modified to hold the female while breeding. I kept them for yrs in community tanks. They dig a bit, and if anybody gets too weak to swim they're food, but I can't ever recall losing a healthy fish to one.I would love one of those badboys! Are they compatable with community setups?