I'm growing one Jock Horror autoflowering plant in my 4 ft Colorado Grow box (which I hate desperately - but that's another post). 8 weeks in, 1st full week in flowering mode. It's a 2 gallon reservoir of distilled water, with 2 tbs of Fox Farm Grow Big and 1 tbs Fox Farms Tiger Bloom added. Ph is around 6.5. When the yellowing began, I also added 1 tbs of Cal-Mag, as I thought the yellowing might be due to a magnesium deficiency. I've already had a problem with algae during this grow, which I have resolved - the water is clean and clear. I can't for the life of me figure out what the hell is going on here. It was suggested I might have a potassium defiency, but I'm just not sure. This is the 2ns time I'm having this issue using this grow box. Any help would be much appreciated.Thanks to all in advance!