Before I tried I checked around and read a post by Amidae (sp) that it's possible as long as the PACMAN cats are bigger. I was curious if anyone on MFK has tried it? People has had failed based on the other thread I posted and the Gulpers ate them immediately. Well it's been about a week and everything seems fine. My Gulpers eat Massivore Pellets along with my PACMAN Cats so maybe I keep them well fed?