Snail's

[pugwash]

Not sure if these are viable in a piranha tank, but Striped Raphael's might work. They are armed with a couple of spikes...

 

[kjenber]

After closely analizing all of your reply I have made a decision .
I will have a talk with the snails tonight and make peace not war .
:bday: you all are right life is to short to get all freak out about some snails.

 

[jgulecas]

I have MTS (intentionally) and pond snails (plant hitchhikers). Whenever I see a big juicy pond snail that I can get at reasonably easily, I grab and smash it with my plant tongs and give my fish a nice escargot treat! Think of them as a live food source.