I was going to say, so KP was saying to force flower it just to figure out its sex and then put it back into veg with 18/6. I think the 18/6 alone with that one warm bulb in there will make the sex be known sooner or later here.

Other wise I think between 4-6 nodes will be fine too, the more nodes the more bloom and a room to snipe clones if you decide to