yes i have been using a miracle grow potting soil, and when i water i once in a while threw in a small bit of plant food, but i stopped when i realized the leaves may be burning because of this. I checked the pH of the water i have been using, and it was around 7 which i believe is normal, i could be wrong. And when it comes to watering, i usually water maybe 2-3 days? I am a little unsure of how much to water tho, i usually fill up a .5L water bottle and split that between the 3 big plants, and maybe all of them, so i am not quite sure if i am over watering, or if it is just too many nutes at this stage.

Also was wondering when i should change to a 12/12 cycle. And if i were to guess i would say that this was a sativa plant as well from what i smoked of this weed before i planted the seeds. As for the lights, would anyone suggest using a lighting fixture that doesnt have the metal reflective sort of dome i have on mine? Or does this not matter much, if at all?