I breed my own feeders. My convict "parents" are fed a diet of cichlid pellets, cichlid flake (mix of many types), krill, spriliuna, bloodworms, blackworms, and mysis shrimp.
My livebearer "parents" are fed the same except tropical flake mix is substituted for the cichlid flake mix.
When the fry are born, they're stuffed with golden pearl for a few days or a week until they're fed to my carnivores/omnivores.
In my opinion, live food is only as good as the food it eats, so breeding your own and "spoiling" the live food breeders is great way to know what you're feeding your fish.