My plant dried up looking for some help

Something terrible is happening..my healthiest plant is drying up! I was wondering if someone could give me some suggestions on how to fix this. My ph is currently at about 8. I have attached 3 pics. One of the pics is a specific view of one of the leafs. The other is a birds eye view of that plant. And the 3rd is the plant growing next to it (which is healthy). I am growing them in a deep water hydroponics system, with 4 total plants. Looking forward to hearing some advice! Thanks.

Bring that PH down, quickly, or they will die! PH Down will do it, for hydro you need to have Ph Up and PH down products. What feeding system are you using? and the npk for the food?

ph of 8? u r kidding right?

For hydro you want ph between 5.5 and 6 ( I go for 5.. That should solve your problem. Either that or its lacking in something...

way to high ph gonna kill em in no time. im surprised they even grew

woah dudee thats way too high i also recommend ph down for hydro .

I am using dyna-grow for nutrients but thanks for the help i will bring the ph down immediately