The two females aren't a good idea together either. If they haven't yet they will try to pick a pecking order. Since there is only 2 of them, they will fight to the death. Females are just as aggressive as males.
Usually, the only way females work together is if there are 5 or more of them in a 10+ gallon tank with plenty of hiding spots.
Now, you could possibly have a rare arrangement with both females doing fine together, but it's not likely. I would separate them or keep on eye on them. Watch for a stress stripe, chasing, hiding, loss of fins/scales, loss of color.