Hikari, NLS, Omega One are good pellet brands that is affordable without draining you bank account and work the same as most change brands like grandsumo, okiko, osaki, ocean free, etc. Like animal guy mention a variety diet and clean water is always the key to a healthy happy fish. If you already have GS pellets and money is not an issue, continue to use it on your flowerhorn(s) with some frozen treat added once or twice a week. Just putting in my 2 cents.