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I've got some seedlings, 3x Northern Lights under 110W CFL + some 20W CFL bulbs, hanging 25 cm (+- 11 inches) above the plants. The EC seems fine, runoff is lower than 1.0 mS/cm when I give 1.0 mS/cm water, runoff pH is 6,5 and I give rain water with a pH of about 6,2. Temperatures stay...

Hey y'all, Could someone please enlighten me and tell me what this could be? I had these brown spots poppin' up on one of my oldest fan leaves. They worried me but because they didn't seem to spread much I didn't think much of it, but now they are popping up on other leaves as well and as...