Autopots and quantum boards - Blue Dream

Growth slowed a bit and I noticed yellowing on lower growth and some purple in stems leading me to believe I had a magnesium problem. I hadn't been adding Calmag because of how hard my tap water is, however this seems to have been a mistake. Mixed up some nutes with calmag and it seems like the plants have picked up the growth rate again so I'm hoping that's all it was. All the plants (not just the monster one) have reached the scrog net and I've been spreading them out under the net every day. I'd say ~50% of the canopy is covered, and I'm expecting to have ~75% and be able switch to flower this coming weekend at the rate they're growing. The plants are super thirsty, and keep sucking down more and more water. My most recent fill of the 12gal reservoir is on track to last ~5-6 days, and they're not even flowering yet. The only problem is that the front two plants have had moist topsoil (err, topcoco) consistently, and I've seen a couple of gnats on occasion. Doesn't seem to be a serious problem though. An addition I might make on my next run is to get inline valves for each of the plants so I can turn off the water supply independently to dry it out if needed next time. I plan on defoliating below the scrog this weekend before flipping which will hopefully help get more airflow to the topsoil to dry it out a bit. I also picked up another fan that I'm blowing under the canopy for more circulation, and have lowered the lights to ~22inches @ 80%.