I feed my cats lots of different things. In that paticular pic it's black worms. I feed live redworms, blackworms, brineshrimp, nightcrawlers, frozen krill, and sinkin pellets. A varied diet for happy healthy fish. Tanks only a 75 gallon right now, gonna upgrade wit my tax check. Tryin for 300 gallons. As for filtration I got 2 powerheads wit filter attachments for water clarity a 405 Fluval canister with a UV clarifier attached. Also have a 55 & 30 gallon. I'm gonna move the Jaguars Gulpers and two Trachy's into the 55. The 30 is gonna stay a quarintine/sick tank.