kiniska, at this point its all play but after a couple months if they are really going at it they need to be separated..I use baffles or a line of stomp fence in a large pen so they are not continually in each others face..they can run around that fence and are kept busy ...Given pleanty of room there is usually little problem until they get older..I have 2 roosters that were raised together at 2 years old they are still together..spring they get a little testy only to each other..rest of the year no problems..If you want to keep your pullets nice , when the boys start to get busy around them, then you need to separate them..I keep a line rooster huts the batchelor pads..each has cliamte control..so they are comforatable and have a run of thier own..
somone else may be able to give timelines ect. and good advise that will be very helpful...but to me they are like people, some are easy, some are stinkers..I just act accordingly..