Bump! I have 2 in a 240G, with cichlids, gourami, lots of plecos. They can be skittish. I thought they were going to kill themselves in the 20G quarantine that I had them in for a week, kept smashing into heater and HOB filter. And when they want to move, they can do so incredibly quickly -- from one end of the tank to the other in less than a second. But they are peaceful, don't bother anyone else, and they usually are handing out next to each other facing opposite directions (like Bosemani rainbows do at night).