My frontosa are more of a threat to smaller fish than my RTC in our tank. He is kinda shy around his tank mates, except for the lima that I think is his secret lover. She never leaves him alone. He would much rather dance for us, and ignores everyone else. he may in the future mess with his tank mates, but he's over 10 inches, and we have bristlenoses, and a little fat clown plec at 3 inches that swims around, and a small 4 inch front who is the smallest of the colony, the only thing he lunges for is food, and it has to be shrimp, tilapia, or pellet. Like I said, he may change, but for now.... he's ok. Soon enough he will have his own pond to play in

They definitely need a big home once they get big. I got Joker at 2 inches last August (09) and I measured him this weekend and he is a little over 10 inches. Not as much growth as some people I read about, but he's deformed, so who knows, maybe he's just a slow grower lol.