PB, I, like you are doing a lot of "new for me things" as far as growing is concerned. I am growing in a mixed media soil, I am growing under an LED, I am using organic fertilizers. I have read as many grow journals as I could easily digest, paying attention to watering and feeding schedules, or in your case reservoir changes and additions. I have made notes concerning light heights/distances. I have closely followed every mention of additive or action in the case of plant deficiencies. This is a great help and you will learn much that you haven't thought of. For instance, if you want to some fantastic info on DWC grow, go read Grey Bear's grow threads, if it's LED growing, you have to go read some of TaNgs grows. Those two guys grow journals will teach you much if you just read through them. There are plenty of other talented growers here as well that can teach us whatever we want to learn