PlEaSe Help DWC wilting!!!!!!

Please help we have been flowering for about 9 days and around 5:30 noticed 1 plant was wilting, went back down and 2 more plants are wilting.

DWC
Room temp is 68 degrees,
res temp is 62 degrees,
PH is 5.7,
ppm is 950,
using AN nutrients.

We changed the res yesterday morning they seemed to very happy. PLEASE HELP they are wilting fast!!!

Any Ideas? The one in the second pic is bad! Fuck me!

They look really thirsty, if you ask me. Normally, when the stem also droops along with the leaves, it's a sign of underwatering.

Its DWC the roots are completely submerged in 14 gal of water.

SO confused!

salt build up? when was the last time you cleaned the 14 gal tank?

Flushed 9 days ago with clearex and yesterday cleaned res with h2o2 before refilling.

Res is changed every 7 days ph is checked every 4-8 hours and is at a steady 5.7

I am stumped!!! Just added 2 tsp per gal h2o2, DON"T KNOW WHAT ELSE TO DO????????

Well, something is stressing em out Bad.... Hmmmm... How do the roots look?

are the airstones plugged up, or are the roots covering the stones?

did ya leave it out for a long time when ya did the rez change

do you always h202

air stones are all clear!

Only left them to air bathe for about 15 min!

can ya top feed em 15 on 15 off from rez with a small pump
i say cause maybe ya fucked the roots in rez and now all ya got is the one in the rez
i did it once

The humidity has only been at like 30% but, it has been like this through out the entire grow. I was thinking that it would be a possibility that it could be the prob but, its only 2 of the 6 plants. 1 is wilted real bad. 1 other is starting to get pretty bad and the rest are slowly following. FUCK ME!!!

I use h2o2 when roots start lookin a little brownish. I have the pump and manifold that i started them of with. I hadn't thought of that. Although the only thing that I did differant is I added AN big bud. I have this foam in the res. I would hate to flush them again and add all new nutes but im starting to think that it may be my only option( I can try top feeding them by hand to see if that does ne thing for em first). Thanks alot for all your help!

add more oxygen to your reservoir...as a general rule your pump should have 1 watt per gallon of water in your res....so, 20 gallon res equals 20 watt pump pushing 2-3 air stones...your ladies look like they are suffocating..as they get older they require more nutrients, water, and oxygen (to roots in DWC)..your oxygen supply may have been enough while in veg, but probably isnt sufficient for flowering.

This will cause them to Wilt?

yep...how big a air pump u usin? how many air stones??