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4 weeks into flowering, so about half-way, this always seems to happen to my plants. it starts about half-way and makes it's way towards the top. Is it a deficiency, an overdose, heat stress? I checked the water that leached from the plants, ph was at 6.0 and the ppm's were at 600. Nothing that I think is abnormal. I think the lights might be too close but i don't want to put them to high to avoid them from stretching. I have 1000 watt hps with a regular angel-wing reflectors and I keep them around 24 inches away. They are always at about that distance so why the heat stress after 4 weeks of flowering, this is why i am more inclined to think it has something to do with either a deficiency or an excess of salts in the soil. Take a look at the pictures, they are pretty clear. It starts from a light case of the problem, to serious damage to the leaves. Please help...