I've heard that they can be kept together, but in a very large heavily planted tank. I heard of keeping them in a minimum of 150g.
big train;691097; said:I have seen a bunch of male betta's in 55 at my lfs the staff says they will not fight when their is a large number of them in single tank.I am not saying that its a good move for u but there was no fighting that i seen while i was there maybe a half hour.