they can eat crabs - try adding a red clawed crab to your tank
Aren't crabs and lobsters in the same tank for your Ps bad?? I mean when the Ps are sleeping, ca crab/lobster can just coime by and *SNAP*. Dead or injured piranha.
Just don't buy a 25" lobster, and the p's will be safe
They can be dangerous, but as long as the crabs, lobsters or wahetever are smaller than the p's, I guess it'll be fine. I actually think crustaceans have much more trouble saving their asses...
I think p's sleep in the mid and upper water levels (that's where I see them when I get home from a night out), so out of harm's way.