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Obviously that's not helping. Why don't you have your temp and humidity in check?

I have thought about using that in my soil but the super high K value kind of made me uneasy. I usually just amend my soil with neem cake, azomite, humic acid, and dolomite. How do you recommend using langbeinite? Is it slow release?

I should of specified, of course I'm using dolomite :P I think you guys may be right, I may have been mistakenly diagnosing a K deficiency as a Mg deficiency, perhaps caused by repeated applications of the Cal-Mag. It's my understanding that it is the Cal that locks out potassium, not the...

I think you're mistaken on your temperature swing theory. 7 degrees difference between night and day is actually quite low. We're talking about plants here, that for as long as they have been around have gone through temperature differences on an average night of 10-15 degrees. Not trying to...

Any other opinions?

No, temperature remains stable between 74-81 24/7 and humidity 50-70%. I hadn't thought that it may be potassium but perhaps you may be right.

Pictures are actually of a few plants, that one that looks a bit funky is the worst affected but the first two pics are of the same plant.

Gave them a big dose of Fulvex (1% Mg basically) (5tbsp of per 2gal) as they were showing signs of Mg deficiency. I frequently water with Earth Juice Cal Mag (3% N, 3% Cal 1% Mg) so I'm not sure why I'm even having Mg problems, the soil is amended with about 2tbsp of lime per gallon of soil and...