Red flag here for me...SMB are not pellet trained at 1". You pull them from their fry growouts once they reach 1-1.25" and begin to train via ground up krill shrimp, then transition to specialty pellets. At 3" they could be considered "feed trained".
Cody has notes on SMB as a sole species, SMB with soft ray minnow species and with other species. SMB will eat their own, but what will maximize growth to get them up to spawning age? Also, I don't believe SMB will produce enough to feed WAE and themselves.
Sorting the minnows, buying from a bait shop or adding YP would have to be done, IMHO.