i feed my fish small amounts 3 times daily not enough for them to be full a small pinch of flake for about 10 fish is all they need .... dont feed your fish at all for 1 day a week that is a break to help their digestive system let them graze on algea if applicable... dont let anything hit the bottom and roll all over the place that pretty much means u feed to much... my fish never look fat anytime of the day... fish arnt bodybuilders lol