Feeding ‘em a High-Protein Diet.
Speaking of “overfeeding”, if you really have sort of a “penchant” for doing it, then feed them high-protein fish foods, preferably the easily-digestible kind (you may ask your specialty stores which ones are they), and with a 30 to 35% protein “level”. Proteins in the fish’s diet ensure less waste and provide a lot of energy to the fish. The indigestible kind of protein is the one that is “secreted” by the fish and pollutes the pond’s water, so watch out for these indigestible types. Or, better yet, you might as well purchase a protein skimmer, too.