Hey Noatec. Very nice DWC grow you have there. Actually ursetup is what I would love to have at somepoint. Right now Im all cfl and LED. I wanted to answer some of your questions that I read earlier.
- Preflowers appear after 4-6 weeks on all cannabis plants. Right where you took that picture earlier you will see a small pistol with 2 this hairs coming out the tip or a round ball that has no hair 2-4 days after noticing. Google Picture Cannabis preflowers and youll see. 100% tellable just by your eye.
- Because your doing 4 plants in that size container I would suggest going into flower now. 4-6 weeks of veg is enough root growth as to not stress the plant with the change of light cycle but you can wait longer if you want. The more roots you have the bigger your buds can be. Of course there are alot of other variables, but you will see about 20-30% growth during the next 8-10 weeks of flowering.
- I think your light might be too close. Looks about a foot?. Either way I dont use hps/mh so i dont know exactly, but I think about 16-18inches from tops for mh/hps is good from what Iv read. You should research HPS light distance from cannabis.
- Also. For future sexing, since you already have your hand in the water hehe. pun intended. you should try out a DIY DWC Bubble CLoner. Same exact thing u got there just 20 bucks not....w.e you paid for yours and much smaller. You can veg for 3 weeks, maybe start a little lst for some shoots after 1 week or so and at 3 weeks snip a cutting and put her in the bubbler. 4-5 days u got roots. threw her into 12/12 and within a week or 2 youll see the flowers. This would take more precise timing as you could probably tell the sex without taking a cutting within that 4-6 weeks but if you plant on say doing 1 or 2 plants next time you would be able to veg the plant much longer by which taking a cutting for sex would be benificial as to not waste yoru time. Food for thought I guess.