When to flip?

I agree with everything M0use said. Personally, wouldn't hurt to do it earlier than later (It took me 3 weeks to find a light leak) after taping every hole, every led emitting from fans, dehumidifiers, ect. Was such a pain. I know people hate autos, but idk...I guess it comes to preference.

You can flip whenever you want and when the plants are mature. Eg you can grow photoperiods 12/12 from seed and they will not flower till they are mature aorund weeks 4-7 depending on the strain. Also who cares what others say, if you want to flip, then flip. I do think its best to maximize the tent space so there is less wasted light. this can be done by LST or HST techniques to get more leaves sucking in all them rays. But if this is your first grow and you wanna see it in bloom worry about trying out some new stuff later once you feel more confortable. Good Luck!

When you fill up roughly 1/2 the sapce... or 70% of Length x Width dimensions (.7 x .7 = .49). You just do your best in that regard when dealing with 2 plants of different sizes.. once you think the larger one can compensate with training for the smaller one and still fill the space fully. LEaves some room away from walls to avoid condensation. condensation is the devil.