Will They Be OK part 2

What up my fellow Tokers. Well since I got that new light on Friday the 13th, my babies seem pretty happy as you can see, but I'm concerned about the leaves turning brown and yellow. I usually try and wait till the soil on top is dry and sticking a finger in the dirt to see how moist it is, and every once in a while, I will give them a good mist spray. Also I wanted to know when would a good time be to start flowering them, I've heard people say anywhere between 12" to 24". Last but not least, I do want to start cloning them, but I can't tell if they are female or male, and I don't want to clone a whole bunch of males, can you still start the cloning process when your in the flowering stage??? That might be the dumbest question I've asked, but I don't want to make any mistakes. and just to let you know, yes it's bagseeds, but the weed was fire as hell so I saved them. Thanks in advance

you can only clone if you have more than one space that you can have different timings on
when your plants reach a nice hight take a cutting from all of them (clearly labled)
bud the cuttings if you get males throw the clone and the plant you got it from and if you get females then leave them in there and take some more cuttings

you grow cuttings and mothers on 18/6 light timings and you flower on 12/12/ timings
look for small white hairs on the females give it a week or so into flowering and then chuck any males and you need never worry about

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and what light are you using ?

it's a mH light, only 175w

Can anybody tell me what I can do about the yellowing and browning of the leaves, and tell me if they look healthy. Thanks in advance