I have several tangs and a moorish idol that I feed LRS reef frenzy, LRS herbivore frenzy, hikari seaweed extreme pellets, mysis, ocean nutrition formula two frozen cubes, LRS nori, & ocean nutrition flake food. I have had some of them since I began and my idol is fat and doing good. I try to vary the food I give them, soak some of it in Selcon, and feed multiple times a day. I feel really good about LRS foods and make sure that is their main diet. If you feel they need it increase the number of feedings throughout the day. Just know that depending on your system it may take time to balance back out and you may have to make changes or upgrades to maintain that feeding level. Good luck