mine thankfully eats everything from krill to frozen foods to all pellets i have (kens, hikari). it's been pretty tame as far as aggression is concerned, but will definitely try and hold it's group against others. right now he can't keep up with the RTM and the jag that he's hanging with, so he's behind a divider. he's pretty responsive as far as feeding is concerned and he's showing good colors. growth is decent at ~1" increase since i got him around 6-8 weeks ago or so. hoping he gets around 7-8" by christmas time.