they normally get on an average of 3 inches when they are full-grow. it take 2 years and up for them to reach maximum size depending on diet and water quality.lack of nutrition and bad water quality will stunt their growth but if the conditions are good you will end up with a mated pair. mine are still young uns. my female is over an inch and the male is under an inch. they just hit some growth spurts. i feed my clowns ORA glo pellets.