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Holy shit this is heaven! Thanks a lot man! And don't worry, I like the technical stuff :)

I've transplanted the seedlings in smaller pots with reflushed soil, hoping it will dry out fast and recover the plants. I own a copy of a Jorge's Grow Bible but totally forgot I had it since I lend it to a friend... I really ought to get that back... Thanks for the help!

The runoff EC is between the limits of 0.8-1.3 mS/cm for seedlings, which I gathered from some internet research. If you consider this too high could you advice me another runoff EC value to aim for? Thanks for your input so far :)

Yeah I already figured i should probably start over, but I measered pH and runoff EC to be within limits. My soil was indeed too hot, because I stupidly fertilized to soil a few months ago and then left it to mineralize... the result was my runoff EC was 3.0+, However, I flushed the soil until...

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...

I consideren Ca deficiency but I had some doubts about it since it is immobile but it's the old leaves that are affected. That might have to do with the fact I'm a month into flowering, and after some research I did find similar symptoms for Ca deficiency on the web so I'll go with that, thanks...

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...