I need help with these. Whats wrong? Can i fix it? How?

I am doing a run of TrainWreck. They are in coco fiber. I usually do ebb and flow with rockwool cubes. I went to coco drain to waste because I no longer want to reuse my nutriants. these plants are a week into flower. can i fix them? I'm using GH 3 part system and I'v been giving them good nitrogine. I have also been using floralicious grow. What the hell?

What's the temp under the light?

Yeah the cupping looks like high temps. But the thin yellow leaves look like a sulfur def.