Im going to go against the concencus here and say that you should see if they will accept frozen foods or pellets right off the bat. I have had small peacock bass (2-3") accept frozen mysis shrimp and blood worms as well as live blackworms. If they dont accept prepared foods then go to live. The key is a varied diet. I do not like to feed goldfish, I prefer rosys. When feeding rosies drop them in one at a time so that the fish make a connection between something hitting the water and food. This will allow you to convert your bass to freeze dried krill and other prepared or frozen foods like silversies and pellets.