Sorry for jumping the gun, I read the first page then jumped to the last.
I see your plants are now looking healthier than ever!
Can I leave a tad bit of advice regarding pests for future reference.
My elimination process.
If it isn’t ‘powder’ like or ‘hairy’ like, it isn’t Powdery Mildew
If it isn’t ‘like a slug/snail trail’ it isn’t Thrips
If it isn’t ‘Fluffy, Super Hairy’ it isn’t Mould/Rot
If you don’t see ‘Webbing’ or ‘Strings’ or pest as obvious as Spider Mites, it isn’t Spider Mite.
Thrips are your most common pest.
Spring Tails are also very common in Hydroponics (both are not sever cases of pests)
Thrips and Springs can both be contained.
Regards
- K