Title says it all. Can you confirm my belief that this is a magnesium deficiency? Had these clones for about a week and a half, they've grown very well and other than this they seem quite healthy. Started a few days ago, I've got 2 Kandy Kush, a Durban Poison, and a Cherry Lime Haze. This one is the CLH and it's definitely the healthiest and I believe that's why it's showing these signs so quickly. Started about 4 days ago with just some yellowing along the edges of one or two leaves, then a little brown spotting, and then a little more complete spotting like this. It's only on 2 or 3 leaves but it's a little bit on the other plants as well. Info: Probably 3 weeks old Clones 20/4 light cycle 300w (5w diode, red, white, and blue) LED and 7 100w CFLs along sides Black magic soil from home depot Black magic nutes A+B Neem oil Been struggling with ph, it's been right about 7 the whole time, trying to bring it down closer to 6-6.5. After my research it seems it's either magnesium or calcium or both. Logically I bought some Cal-Mag to remedy and ran a teaspoon in a half gallon and ran some through 2 days ago. Also mixed some in with some ph'd water in spray bottle and have been spraying the leaves of all plants multiple times per day. Roots are peeking out the bottom (all nice and white btw) and I'm going to be moving to 5 gallon tomorrow along with a ph'd, cal-mag'd and molasses flush. Oh also all stems are mostly purple with some streaks of green. Thoughts?