vsnsofadrgn - how big are your Peacock Bass? If they are small, under 6 inches the temp of your tank needs to be higher (between 82F-86F) in order to prevent ich. From what I understand they are very prone to this when they are young. Also it is recommended you do large water changes each week, 50% to 70%, because they produce alot of waste from eating tons of food. How large of a tank are they in? You can get them onto frozen and pellets by dropping live food in the tank and every 4 one drop in a pellet or frozen food. You are trying to train them to eat whatever hits the water and not bother with what it is. Feeding live feeders will get expensive when they get larger, they typically grow to 2ft and the larger species up to 3ft. They recommend a 180gal tank for one, you could keep other non-aggressive fish with it as long as it is large enough to not be eaten. I had a 3 inch p-bass eat a 2 inch p-bass, except the large one couldn't swallow the smaller one so both died.
