For me it's a over fert burn. I had that before in bubbler also. EC must be to high, lower the EC putting only water or flush with PH balanced water during a few days ( 2 or 3 ). But maybe an expert can commit ?
Fhydro
fhydro Reviewed by fhydro on . Any help with this discoloration would be... helpful. I've looked on over grow and and it looks like so many of th epictures i cant really tell what it is. Some other leaves a little high up have some minor spots the same color. iTs not calcium or magnesiumbecause i put cal-mag in there. Setup is a bubbler. Never any problems with PH. Rating: 5