Switching your light cycle to 12 on/ 12 off is what causes them to flower and bud. Did you do anything about the 90 degree temp? Knowing that and looking at your photos, I'd say heat stress is causing the brown spotting. Too hot there. Can't remember if you wrote anything about getting the temp down.
polishpollack Reviewed by polishpollack on . Plants are dieing, please help! Hydroponic DWC Setup Grown in rockwool with rocks on top(recently had algae on top of rock wool, thats why the rocks are on top, I think algae was raising my Ph to 8 every 12 hours or so... I recently cleaned and refilled added new nutes) Lights 18/6 5 24" fluorescent plant lights 1 18" fluorescent light 1 18" Blacklight ALL 3" From Plants Lights cooled by fans Fans on plants 3 Air pumps running on high 24/7 Rating: 5