help my plants are yellowing and roots are turning brown

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.

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

nanskies said:

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

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

have you checkd your ph levels

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

my medical707 said:

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

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