Unrelated to the question you asked, for 4 females you should only need 1 male, really 2 so they can keep each other company when not breeding. After they breed and you put them back together, make sure to re-introduce them in a clean environment etc. because the scent of females can cause a fight. I put a dab of vanilla extract on them behind their head where they can't rub it off because the scent will mask the scent of the ladies.