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Yup. Also, the raised edges indicate high temps. Get another fan in there or raise the lights a bit.

Buds require alot of calcium, magnesium and phosphorus for their production and metabolism, so having a deficiency of any one of these will reduce yield and/or potency if not taken care of.

Yes, of corse, flushing takes out almost all of the nutes you added to the soil, but in 3-6 days after flushing you can start using nutes again without the worry of any deficiency.

Nothing else left to say. Completly normal. Those leaves are just useless to the plant now.

best advice.

BS. I've noticed that guys at hydro stores really have no idea what they're talking about... plants are different, their roots, absrobtion systems and thus sensitivity towards lack of certain nutes and elements may be greater than those of other plants. But saying that the plant looks like that...

26.7C is perfect. You should worry about temps that go over 35-38C. Don't trim the leaves.

Mag is locked out at a soil pH of 2.0-6.4, so it's not really hard even for experienced growers to have this happen.

You can find neem oil at plant stores or any large store with a garden department. 0.5-1l water will be enough.

Right, if you want to avoid any of those 4000 additives that screw up our health, go with some tobacco products without those pesky additives. I don't use any soap with this, but it sure as hell can't harm the plant to throw in some neem oil to be 110% sure you get rid of spider mites.

Soak 3 strong cigs in water overnight. Boil solution in the morning 2-3 minutes. Let it cool. Spray it on the plant, being careful not to get iti in your eyes. Worked for me every time.

Not much else to do, that's just heat burn, not any nute burn o deficiency. Just take care that your plant won't be exposed to high temps any more, maybe mist a little water under the leaves (not above, may also cause heat burn), but that's basically all you can do.

Right on, but seeing that only magnesium is a mobile element and the deficiency didn't start on the very top of the plant, it's a mag def. Cal-mag, 2tbs/gal molasses every watering or epsom salt will fix this.

Nitrogen, as well as magnesium are both mobile elements, so a deficiency of either of these would not affect new growth, but bottom leaves and slowly works it's way up. Plus, a magnesium def looks different, causing the leaves to become light green and eventually yellow between the veins, in the...

I think the one on the left could use a bit more trimming, but it's best if you wait a day or two and see what happens.

There are still certain differences between your leaf and the ones in the pics. Still, it's better to be open to suggestion. If you think that it's P def and say that the plant had absolutely no nutes added, then it's stupid to argue that it's nute burn, although that would make this the...

You can even find it in some supermarkets and health food stores. 2tbs/gal every watering.

Yeah, it's cases like these where democratic principles have absolutely no meaning and use. If a billion people voted that it was female, that wouldn't change the fact that it's definitely a male.

Good call, that is zinc def. Molasses, 2-3 tbs/gal every watering. Molasses has all necessary microelements, including zinc.

The brown spots = calcium deficiency. 2tbs/gal molasses every watering or cal-mag will fix it. Droopiness = N toxicity. It's not because you overwatered, it's be cause you fed the plant too much N. The leaves have turned dark green because of it and are getting too heavy to support. Flush and...