Ok so getting a bit concerned.
I'm trying to keep nutrients low, but am noticing spotting on some other leaves and some of the white pistils lower down are growing in brown instead of white.
Spotting on at least one of the plants has gotten to the degree I've trimmed it a bit and the lower leaves look fine.
Please let me know if you see an issue with any of the above pictures / advice.
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Update:
Ok looks like I have a bit of light burn and possibly some nutrient issues as well.
Have been adding more cal mag.
Trying to water a bit less than was as may not have been letting the coco dry out enough.
And I have moved my LED lights as far up as is possible currently to try and see how it goes, not sure If I've mucked this up or will still get a decent harvest.
Any thoughts and suggestions are welcome.
Edited: 28/09/18
Got a nice mini led microscope to check out my affected leaves.
https://www.amazon.co.uk/gp/product/B00LAX52IQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Glad to report that I have not seen a single mite on any of my checks between 60 to 120 magnification.
Even split open a stem where I had to remove a leaf earlier and had a look inside just to be sure.
There are lots of little circle type globs on the leaves, but I take it this is trichomes and not eggs.