trust...i threw in mosquitofish long ago so they are all over and then put in convicts last christmas about the same time as the first tsn and marbled cat, so they have a few generations to offer as tasty morsels. its a big science project as far as trying to create and equilibrium of food fish to predators. Hopefully i got it right. I know a guy that has a pond with 3 BIG tsn, a few redtails, and a bunch of i think pangasius. He has tilapia in there and the cats cant keep them under control. He also has some of the biggest pacus i have seen, easily pushing 25 lbs.