Even if if do you have healthy feeders and etc.... the nutrient value in a pellet over exceeds any feeder fish.
You could gutload your feeders with high quality food than feed them. just start small and he will hunt on his own. still ill-advised on going the feeder route... creates more aggression on your fish as well. I have a 15 inch endli living with my 3 inch seg., the only reason he has not chopped him up yet is because he has been strictly on pellets, and even after 5 days without food, he patiently waits on the pellets and doesnt make a quick lunch of my little segs.