Hi everyone. This is my first grow and my first post. I have a five week old Auto AK. Hoping someone can help me out. Lower leaves have been yellowing and a few have died and fallen off with some brown spots. Will start on a leaf as a few small spots and gets worse from there. Started low and is spreading upward. I think it's magnesium deficiency and has treated it as such. I've been using an Epsom salt foliar spray on the tops and bottoms of the leaves but the problem has persisted and is spreading. My concern now is that I've misdiagnosed the issue and that the plant will die if I don't get it taken care of. If I'm correct and it is magnesium, it's not resolving with regular Epsom salt spraying for the last week or so with irregular spraying the week before that. Growing under a Galaxyhydro 300w LED (actual wattage around 140) and two 23watt CFLs. Soil is mixture of Foxfarm Ocean Forest and Foxfarm Light Warrior, mixed about 60/40 but not exact. Up until a few days ago have only given PH corrected water and an Epsom salt foliar spray. Also small yellow tips on new growth. Started before any feeding. Two days ago I fed Foxfarm Big Bloom - 3 tsp per gallon and some molasses - either a 1/2 tsp or 1 tsp. Included 1/2 tsp of Epsom salt per gallon - I've avoided feeding Epsom salt to the soil but I was desperate as the yellowing has persisted. Also, two days ago gave a foliar feeding of Epsom salt, molasses and a tiny bit of Foxfarm Tiger Bloom. About a week ago I tested my runoff water and found the PH had gotten too low. I corrected that and since then have transplanted to a larger pot and new soil. I initially did the Epsom spray out of concern of a sulfur deficiency - the leaves were all light green. After only a day or two of spraying the leaves darkened a little, but then the yellowing and spotting started. Any help in diagnosing or suggestions to treat this and get things back on track is appreciated. Might get some dolomite lime tomorrow and top dress with a little dissolved in water. Also might get a bottle of Grow Big for the nitrogen. A member on another site said it looks like nitrogen deficiency. Would nitrogen dif cause spots like this?