IMO as long as you maintain proper water quality you cannot over feed MOST fish. There are exceptions such as anglers and some other predatory or sedentary species.
I feed my juvenile fish as many times as I can throughout the day without lowering my water quality. Usually this ends up being between seven and ten times per day. My Dult fish get. Minimum of three feedings per day.
One must remember what fish do in the wild. Forage for food. EAT, EAT, guard territories and spawn. Many species forage constantly throughout the day. It cannot be good for their digestive system or metabolism to go from almost constant small shouts of food to one large feeding per day, most fish are just not used to this.
~Michael