HYDROPONICS/Aero Ponics/Coco/Soiless/
How long has this problem been going on? For A week or so..
Are you growing in a PVC grow tent? (example: Hydrohut or any other non brand tents)-NO
What system are you running? (DWC? Ebb flow? Aero? Water Farm? Flood Tables? and so on...) DWC...