APG(Adv.Seeds) First Grow

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You are growing with soil. So like the guys said rather underwater then over water. Ad some calmag to your water for the yellow on the leaves as well as the purple stem. And don't ad heavy compost it can be that its burning the plants. Get a soil pH gauge. Because the soil might be at a high ph. Just things I think you should check. Also just my opinion change you light schedule to 16-8. Gives your plant rest and your light . Hope it helps.🙂

the best action would be that; buy a fabric pot,fill the pot with soil and MIX PERLITE in it at least %40 , this will make it dry faster and get more O2 to roots.

Those are called pre flowers, the plant is just showing its sex, nothing more, it is not entering flowering phase

It may just be how she looks. Your light is high enough given the information I checked from Philizon. Your parameters are close to "green zone". although your humidity is quite high given the temperature. There is a handy little chart I like to use. http://www.just4growers.com/media/23631/vpd_2degree.gif

hey there you have a phosphorous lock out from too much nutrients. This you can see from the yellowing in that way on the leafs as well as the slightly burnt tips. Basically the plant decided not to take any more P so you have the deficiency symptom even though you 're giving too much nutrients. The next two watering go plain water then add less NPK , then resume as you were but follow two plain waterings and one nutrient watering. Hope this helps ! 🚀