@lightbox420 At least if you can figure out the problem, you can stop it continuing to develop too much. My advice below is probably irrelevant to your hydroponic set up as I use soil these days.
I wouldn't expect to get the leaves back to healthy, but if you can halt the problem's spread you would be able to get them in. I haven't done hydroponics for 25 years and I was in Rockwool, but it looks like a nutrient issue of some kind, unless there's some sort of blockage stopping the medium becoming properly wet throughout. Very unlikely in hydroponics I know, but when my soil dries out too much, my plants don't generally wilt, but they get leaf damage that looks similar to that.
Finally, is the light high enough up? I've had light burn that looked a bit like some of that damage. Do you use the free photone app to check your PPFD / DLI? Daily Light Integral is my favourite way of judging light. Just a thought.