I want to get a family of tank raised percs or occellaris, i'm siding towards the occels because i've heard they are a little more peaceful, though I like the coloring of the true percs a little better. Anyway I would like to eventually have a small family of them, or at least a mated pair. I plan on buying them young, and was wondering how many is a good number. If I only get two is it guaranteed that one will become the female and they will be a pair? Or do I need a group so they can naturally form dominance? If I get 3 or 4 and 2 pair up will they pick on the ones that aren't paired? Thanks for the help...