Calcium deficiency, nute burn or fungus ?

Wet Socks

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  • Growing indoor under Mars led
  • Water once a day or once every two days
  • Plants in Hempy buckets in coco/perlite 4:1
  • FastBuds auto plants on week 7
  • Feed full spec nutes at EC 1.6 with CalMag
  • Most plants very healthy, a few are lightening up.

So these spots are appearing on a few leaves over the last 3-4 days and more so on the lighter leaves.

I'm struggling with humidity at the moment. It's 90% outside and I'm only managing 65-70% inside with fans roaring and Dehu on.

I'm planning on getting a larger Dehu next week as buds are thickening up.

I've tested the run off and PH at 6.2 is fine as is the EC so there shouldn't be a nute problem so wondering whether this is septoria/fungus or a cal def or nute burn even?

Even tho I feed CalMag every watering at 1ml/L is it possible some plants would still be deficient?

Thx.
 

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