I am honestly not sure what this is, I have been fighting with it for a couple weeks now and I don't know what it is. Any help is appreciated. 250w quantum board, 18" front light to canopy. Organic "super soil" I made Mostly water, have given 1 AACT with guano, liquid kelp, high brix molasses and some of the soil I made. Cal-Mag added at 5ml per gallon. PH'd to in between 6.4-6.8. This happened before I gave my first AACT. It is only happening on 1 of the 2 plants I have, both Raspberry Diesel from HSO, from seed. The leaves are on the bottom after I pruned below what I thought would be best light penetration.