:wall:Ouch, Grain of salt, don't have to be so harsh, I was trying to help the guy. My first Post says Nothing about my experience. Guess I'll watch my posts more carefully! Thanks Roseman!
Maybe the PH is off just enough, and they can't absorb the Nutrients correctly, and/or like Roseman says, it's under, or over fed. Try one thing at a time to better determine the cause. Good Luck!!
I had the same problem. Your watering too often. Really, only NFT systems should be run 24/7. The Air pump should be run 24/7 on all systems. Try running the Nutes for just 30 minutes, every 3 hours or so. It gives the roots time to breathe. Split it up during your daylight hours. About 6 times...