It's not too late at all, but this can get tricky depending on your ability to keep them separate... it's not possible for a lot of folks and their birds suffer because of it. Are they currently fighting or drawing blood? If not, that's really lucky, but you don't want to give a chance for it to happen, healing takes a long time.Thanks for the info, but its 10:30 am and i already let them spend the night together, is it too late to separate them? Also take a look at the crappy diagram attached, they both need access to the coop, but there is only one door. Should i make another before splitting it down the middle? Should they even be in the same at night? The dotted lines are where im thinking to separate, you advice?
Sleeping on the roost together at night is fine. Some people choose to start the integration that way. It's just when morning rolls around there still could be problems, especially if you're not around to intervene if necessary. I don't think cutting a new pop door is needed. If possible, every morning you could just go out and put up a temporary divider during the day so they can visit without touching or pecking each other. And don't forget putting food on each side of the divider line --most aggression comes from defending food. So the sooner they can get comfortable eating in each other's presence the better.
Do you free range? Letting them in a bigger space together can help too. How big is your run? Hopefully it's at least 60 square feet (10SF per bird). If it's absolutely not possible to keep them separate in the run, add lots of hiding spots to break line of sight for the chasing birds. Extra perches or a couple plywood sheets leaning against a wall will offer some protection.