Thanks for the info guys, I think i'm going to go with 3 odoe and hopefully get myself some hard hitters! Do they like fast flowing water?
Nope. Every group I've kept will try to propel themselves into the fast moving water. Example- 3600 gph return pump on a 150 gallon tank. Where the water returned to the tank they just kept trying to jump into the water smashing themselves on stuff. Seem to think they can get out wherever the water comes in. This was an old ATF grow out tank. I just valved back the pump and they quit jumping.
All mine have preferred calmer conditions which I think goes back to their natural habitat of slow moving streams and lakes.
I've never experienced any kinds of aggression with these fish - BUT I've always kept groups of 4 or more.