help save my girls...w/ pics

[golflover123]

i am growing some bag seed and am around week 6 of flowering in dwc 1st grow...my largest girl recently wilted away and died. now my other plants are looking very similiar to one that died...very droopy leaves...the roots seem to be getting darker but it's hard to tell from the pics.
ph 5.75
ppm 1500
air temp 77-87
water temp 82
gh nutes with big bud...super thrive...h2o2
thanks in advance for any and all suggestions.

[golflover123]

anyone?

[Ganja Guerrilla]

what was the last thing you did to the res?

Id change the res out asap

[golflover123]

Originally Posted by Ganja Guerrilla

what was the last thing you did to the res?

Id change the res out asap

nothing really..it's been 10 days since i last flushed and changed the nutes.
today i changed the buckets to 3 gal black buckets with 3 different airstones and i just found out the water temp. was way too high (80).
i rinsed the roots with ph'd water with h2o2 and got the water temp down to 70.i put the ppm down to 800. i hope this helps but it seems it maybe too late???
do you how long before i should see some change?
thanks