clones take too long, you need to know NOW! right? it is OK to sex early . You are at the perfect point so 12/12 for a week (probably even less) should be long enough to know for sure. Post pics too if you can that is the easiest way to tell, let others decide! they will slow down a little after going back t0 18/6 but they will be fine. This is the only way I do it.