Plants don't determine their sex until the 3rd week or so. You won't be able to see it until it has flowers or pre-flowers. If you're forcing them to flower then that will probably be 1-2 weeks into flowering.

As for the 3 days of darkness, I haven't heard that anywhere but I'm only on my first grow. Since it came from the same source as the 3 sets of leaves thing then I wouldn't think any of it is true.

You probably want to wait until the plant has 5-6 nodes at least. They'll grow around 2-3 times their size once you flip them so keep that in mind too if you're limited for height.

Looks good so far! Keep it up.

-canuck :jointsmile: