I can't tell if the yellowing leaves are an indication of Nitrogen deficiency or magnesium deficiency. So, I added FloraGro back in, corrected my Micro:Bloom ratio, and added CalMag. See if that helps anything. Seems like whatever this is has really slowed it down a lot.
Found spider mites... Spraying with Captain Jack's Deadbug spinosad.
Sprayed and wiped down tent with Isopropyl alcohol.