Is this nute burn or heat stress???

And yes, Walmart (maybe the other big box stores do as well) sells Alaska brand calmag...personally, I've used it and I think it sucks, but it worked enough when I needed it in a pinch...it's better than nothing.
 
I'm just not seeing temperature issues here.
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As you see here, nitrogen toxicity normally involves darker green leaves. I'd do what Blitz said, Cal-Mag should darken them up if that's the issue. Can be a problem in flower though, so watch out.


that looks like root mites to me... i would add a little neem oil, maybe 1/2 teaspoon to a quart of water, add a little each day until they get the idea. spray leaves with pure water every day as well. now if i could figure my problem out. john
 
that looks like root mites to me... i would add a little neem oil, maybe 1/2 teaspoon to a quart of water, add a little each day until they get the idea. spray leaves with pure water every day as well. now if i could figure my problem out. john
You sure? I think that's a typical symptom of dog urine being within 10 feet of the plant? This is a hard one! lol
 
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