help my plants are yellowing and roots are turning brown

[my medical707]

they are looking bad. GDP. 3.5 weeks into flowering. it just started last week after i think i burned them? not sure.. please help. also the water temp droped. roots are roting.

 

[nanskies]

sounds like root rot...is this a hydro grow

 

[my medical707]

sounds like root rot...is this a hydro grow

yea.rockwool qubes on slabs. drain to waist but doesent drain...it evaporates out of the tray. on a drip system 1 gph dripers

 

[nanskies]

have you checkd your ph levels

 

[my medical707]

i have a hanna meter for ecu/tds+1396 and ph+6.8. the meters are a few years old. the stock water reads=260ec/tds and 6.0ph

 

[BigVape]

i have a hanna meter for ecu/tds+1396 and ph+6.8. the meters are a few years old. the stock water reads=260ec/tds and 6.0ph

Your PH is high for Hydro, they probably aren't eating well, set your ph to around 5.8.