Diesel Ryder - Deficiency or Nute Burn??

[infused]

Well a few days have passed. Its only getting worse. Followed all the advice given which I really appreciate. I just have no idea whats going on. Here are some new photos. Im almost embarrassed to show these photos but it must be done. Im so bummed.

 

[Muddy]

That looks like classic P and Mg deficiencies to me. I don't grow hydro so can't advise on the best way to fix it, but that's where I'd look. The fact that it's only happening on the DR tells me it's strain specific and usually issues like that are nutrient related. Different strains often have different nutrient needs.