Fish Growth Secrets From a Scientist Feeding fish the right amount is important. Too little, they won’t grow. Too much, and you waste food and dirty the water. Two to three times a day worked best in my study with small fish. Follow for more practical advice on how often and how much to feed your fish for optimal growth and health. #FishFeedingFrequency #AquariumCare #TropicalFishKeeping | DrTims Aquatics