Can anyone identify what this is?

View media item 1670574
this is the schedule I follow and I change the rez once every two weeks usually
I fill up rez to 13 gallons and change it when it runs down to about 7 gallons which is about two weeks

I run nutes between 5.5 to 6 it's around 6 right now
I have no bugs or pests what so ever in the tent either
and I'm doing the aggressive vegetative growth and am about to transition to bloom once I figure out what's up I could flush the plant and see how that goes but I've tried that once and the problem persist
 
GH-Flora-simple-recirculating.jpg
 
This is the schedule I've always used for 3 grows now in DWC

Works great for me ..I'll add koolbloom and Terpinator in flower, but that's all

Much less than yer using and way different ratios
Recirculating-Nutrient-Schedule-custom.jpg
 
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