I had exo's in with my p's for a while. It worked for about 2 weeks. I thought "cool, no problems" but then all of a sudden within a another week or so I started missing some, I started with 10 exo's in with 6 p's and ended up with 3 left in 4 weeks. That's some expensive feeders at $5 a piece. But you can never know what a p is thinking at anytime. They can look past a tankmate then just turn around and eat them. Pretty much nothing is safe with p's, sometimes even a pleco is not safe. Maybe a pacu will work but will eventually outgrow the tank.