I've been considering feed, water, water for a while, will give it a go now! I'm currently at 2ml/L AN, 1ml additives.
My coco sits in 300-500ppm, runoff is allways lower than my feed(650) so I would be surprised if they're overfed? I've been using this feed since week 4 and haven't had any symptoms until now.
Water stress however, is almost guaranteed. I bottomfed it with luke warm water a couple weeks ago, they sat in stagnant water 24/7
One of my many brilliant ideas.
It's hard to get a good picture, but the leaves have this growth, these small hairs and clowdy crystals on them that looks to me like rot or mildew or something. The healthy part of the leaves doesn't have any of this.
The hairs grow straight outta the leaf. Crystallization/presipitation perhaps?
However I'll give your advice a go, I can lower the feed som more and flush it out.
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Thanks again, mate.