Discoloring leaves

Do-Si-Dos strain all in all she is growing very well. I have noticed in the last few days the discoloring of some leaves. PH is 6.3 ppm is under 500 she gets food once a week and plain water the other times. i have been feeding her Fox Farm grow big and calmag.

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isnt there anyone out there that can tell me what this issue could be?

My last grow got all jacked up from using ro water with no mineral supplements. Maybe u should try something like Big 6 from buildasoil, it has a lot of minerals in it beside calmag

Looks like potassium magnesium she needs are you using cal mag ?/