Is your friend growing in soil? Maybe top dress with worm castings or bonemeal or even manure if he's got a strong stomach. I use GH hydroponic nutrients mixed according to the label when I see a problem. It's just instantly available.

JimmyCreedog said:

Is your friend growing in soil? Maybe top dress with worm castings or bonemeal or even manure if he's got a strong stomach. I use GH hydroponic nutrients mixed according to the label when I see a problem. It's just instantly available.

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No, he grows in Coco Coir ^^ Therefore I specifically wrote that he is using acti-vera, because that's the only source of microorganism in that situation :D
I looked up the nutrients that you use, and as far as i understand, they are mineral-based and therefore instantly available (also what he used before). I know that organix ones have to be broken up before being available, therefore they definitely are not instantly available ^^ What I'd like to know tho, is how fast organic nutrients get broken up by those microorganisms

Sorry if i came off as rude at some point, I'm not a native speaker and therefore sometimes don't know how to put it in different words :D