We're new to having a flowerhorn, but from what I have read, a lot more has to do with genetics than the food (assuming you are feeding a quality food w/ the right analysis). I had just recently asked on another thread what foods are recommended and got a couple answers... currently, we're just feeding OSI's flowerhorn pellets (what the shop recommended) and occassionally some flakes and bloodworms. Only had ours a week so clearly, I'm NO expert. However, I can see nice changes in him already.