I have this same problem Peace khalifa, I think? Are the leaves shiny also? I noticed this morning some darn little white specks flying or hoping on the leaves. Either thrips or spider mites.
Yours also looks like either calcium deficiency or excessive potassium. Calcium deficiency can occur if the pH at the roots is off as well.
​​i'm going to use neem oil before I turn the lights off tonight. I'll rub it on the leaves top and bottom but stay away from the buds. I'll also add some Calmag in the morning. Might as well be safe with various variables.
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Hi guys .. Sorry for my mistake i toke a look at upward of plant and There is not even one of Mature Pests ... but when i take a little Dig better with my Loop . i found some Eggs on upper leaves and when i look Downside of Plant I See the Clony of spider mites infection ... in this case i was noticed too late and i cant Do anythings at 7 weeks of blooming.
i harvest my plants and buy a Chemical Miticides from Bayer-germany and tryin to fix this issuse ...but my infection in a very very Critical Level .. i thinks mites can get back in my new Grow .. im Very scarry becuase we don have any Special Organic miticides such as neemoil in countrey