I was wondering if someone could tell me some information about these little fishes. I have 6 of them, no clue if they are male or female. I have had them for a year and a half. How old do they have to be before they will start breeding? Is there a way that I can tell the females from the males? And is it normal for them to just hover in a school? The reason I ask is that is all they do... eat, and stay put till I get close to the tank, then they scatter like roaches. Any advice would be great.