Thanks for the advice. Was thinking about the CaMg route, but noticed the top leaves are the worst and those underneath the yellow leaves were mostly green,
Here's two others Both grab bag Mexican Haze. One showing the yellowing the other just turned purple. Turns out Trichomes on all three Haze are 90% milky 10% amber and the Gelato 50% milky 50% amber so it seems they're ready to harvest anyway after 7 weeks flower, 12 weeks veg (manifolding...
Been having this yellowing issue for quite a while, although it seems to be worse lately. I'm a long time inside/outside grower, but 1st 2.5x2.5x5ft tent grow under an LED light (Mars Hydro 1000). I'm seven weeks into flower (Gelato) and been using Fox Farms Big Bloom and Tiger Bloom. NPK and PH...