My dats switched from live feeders to krill and freeze dried shrimp fairly quickly. If you can get the others to do it; pellets would probably be the best alternative for it.
mine eat thawed out silversides, frozen krill, pellets and some market shrimp but i find some will only eat one or the other, some will eat 2-3 of them, None of my dats eat feeders anymore. I wish they would all eat pellets though, the one that does is growing like crazy.