I really like Hikari's Cichlid Gold pellets. The fish go nuts for it and it's color enhancing formula is much better than Tetra's (at least through my experience). I prefer pellets due to the larger size of my Africans and it's a bit cleaner, however I have given them a bit of the Ocean Nutrion Reef Flake that I'd feed my Amazonians (before I took down the tank) and my marine fish. They really seem to like that. If it's herbivorous you're buying for, Ocean Nutrion's Formula 1 and 2 are very good products that I like alot. I also incorporate blood worms, brine shrimp, silversides, and krill into the diet occasionaly, but Hikari is definantly the staple. That should be balanced out enough so that you don't have to worry about the welfare of your flora-eating fish.