OK heres a couple things. you want to buy some fish that help break in your tank... like blue green chromis they are cheep. the next thing is YOU FEED YOUR FISH EVERY DAY. water temp should be a little lower like 80 deg. your lights around 8 hr then off for 16 hr. if you bought the fish from a local store then let us know so we can stay away form that store. they should have never sold you those fish for a new setup tank. and should never sold you a grouper at all. most grouper grow 16-40 inch. and will eat your other fish. dont give up. just ask you can save your self alot of money and frustration.