I have 2,in separate tanks. I also kept them for several years before moving. IME; they never bother other fish, except edible size, will eat almost any invert. Again, IMO, the Australian type is a far superior fish to the I.O. variety; better color, usually arrive in great shape (typical of Aussie fish), take a while to get comfortable, a very stocky fish (for a wrasse). They need a lot of room; great fish!