I don't know, as I'm not a hydro guy. Did you check your other thread for an answer to this same question? :wtf:

Looks a bit like overfertilizing or overwatering, but I'd wait till an experienced hydro guru comes along before making changes based on my guesswork. While you're waiting though...copy-n-paste the hydro troubleshooting form here, and fill it out as completely as possible.
Rusty Trichome Reviewed by Rusty Trichome on . HELP! Can someone tell me whats wrong? Hello, I just started growing aeroponically and I am in week 3-4 right now and my leaves are having problems PLEASE HELP ME! WHATS WRONG WITH MY BABIES?? any help would be very helpful, please respond, thanks so much..Look at attached pictures(I need to know whats wrong and how to fix it) Rating: 5