calmag potassium deficiency

Specs : Day 17 flower. 3x3 tent, 75-80degrees, 45-60 Rh depending on when I watered. Soil I am using is Roots Organic. 400watts LED, 2x SF2000. Taller Girls are about 12-15 inches from light . Supercropped them down tho to make even with rest of canopy, and lowered light to 80% intensity. So I...

Since the beginning I have had problems with leaves turning light green in between the veins, then slowly turning brown and crispy along the edges. This will work its way in towards the middle of the leaf and eventually the whole leaf will die. It has affected all plants, and I've never been...

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Hey im in week 3 of flower and all of a sudden i started getting these small brown cirlcles on the leaf edges that then turned into a kinda of streak on the edges. im feeding 1000ppm to 1200ppm on .5 scale.. I am using R.o water and i added 150-250 ppms of calmag. i just did a feeding of 1200...