just curious about your experience. Please add the species, method/food used and time it took. Only Serrasalmus species, though. I know those red bellies out there eat flakes
never had issue get them off live. usually don't feed for few days after put them into tank then offer only non live, all mine took them right away, except my 4"er but it didn't take long for it to start eating.
Like Jp said its not that difficult to get them off live to frozen food, it is however a lil more difficult to get them on pellets depending on size/age of the fish