I have an electric coffee grinder that I use to grind fish food pellets. I don't have any scientific evidence that it works. But, I've used the ground feed in my aquariums, cages, and aquaponics tanks with fry and small fingerlings. As the fish grow a little bigger, I mix in small cichlid pellets or trout pellets. Then I graduate to small pellets for ponds.
It seems to work.
