I have her on a diet of feeders from a trusted LFS...I quarantine them for a month and feed them a steady diet of crushed up hikari gold pellets...because she's so picky..I have a small Sunny and a yellow pirch in the tank that I feed Rosie's too and the Tigerfish won't even look at them (the Rosie's)
Most predators if diet is live feeder (quarantined and well care for nutrition) always look better, grow faster than those predators main diet on pellets/carnistick/massivore...might be its just me cause I hate to use pellets in the first place lol