Seedlings shrivelled up with ph adjust

Currently running a sterile rdwc setup using h2o2. Total volume is 240L. A couple nights ago my chiller packed it in and temps have been rising to 26C. Now the problem is my new chiller won’t be for a few days and with the increased temperature I’ve noticed the ph climbing, I adjusted with some oxalic acid as it’s what I had to hand (waiting on the phosphoric acid in the post as well) but I checked the plants health again in the morning and it’s majorly declined. Currently doing a water change right now but is there any chance of them surviving this ordeal??? Thanks any help is appreciated as this is my first time with hydro!

The plants have skimpy shrivelled stems, leaves started curling and browning in random spots?? First imagine is from yesterday to show comparison.

There's always a "chance" they'll survive, but at the point you're in now, I'd just pop some new beans. If they live, it's gonna take a while for them to recover.

Edit: As you say, they are a bit stretchy, what light and how high above the plants?

scranny - Scranton?

Sorry to hear about the water chiller. That hurts…the grow and the wallet. My chiller is from 2017 so I know that bill will be coming due fairly soon.

@Phytoplankton, as usual, you're on to something. My hunch is that light and watering are part of the issue; watering as in too much water, that is. I killed a fair number of seeds by putting too much water on rock wool cubes (check) that had very long, translucent stems (check) and ended up needing toothpicks for support (check), and some of them died (??).

[time passes]

Found it. March 2021 - one grow in 2017 that never got to chop then started again in early 2021. First whack at it. I documented it as "carnage".






Re. light - seedlings don't need a lot of light but, if they don't get "enough" light, they'll expend what energy they can create to getting closer to the light instead of getting a thicker stem and growing leaves. That makes the seedlings very weak and they'll fall over.