The way I see it is to give them a variety of food from pellets, frozen, and feeders. Mines are able to go back and fourth with each type of food. I try not to over feed my fish as to me this create them to be really spoil and a lot of food will be wasted. If you feed them just a small portion they tend to be more excited when you feed them. If you want to get them off feeders and go on pellets. I would first try to get them use to frozen. Start them out with market shrimps. and then stick a piece of massiovore next to it and try that for awhile. And then slowly try the pellets alone and see what happens. Its all about patience. what ever they don't eat take it out right away. Or try adding another type of fish in there that will eat the food so it gives them a competition. It will be a starving game for awhile which is perfectly fine. Fish in the wild isnt always on a full belly. Good luck Ive gone through this process for awhile now!