A good high protien sinking cichlid pellet would be good. I dont like to order online so i only have one option at my local lfs for sinking pellets, its called african cichlid attack , comes in a big red can i shake it in and they go nuts for it. I also like to feed them freeze dried krill (I put it in some warm water for a couple minutes then drop them into the tank (usually results in a feeding frenzy lol). Might want to stay away from floating pellets as much as you can. Mine also will eat flake food (I have some large gourami that have to eat flakes, so fronts get some of that too) but it can make your tank dirty if your not careful with flakes. As a treat i also will hand feed them tubiflex worms (my fronts are still small enough i can keep all my fingers lol). Thats what i feed.