Mr SLDL,
I have to say Dude that it's sort of different posting on your thread. You did those manifolds like a pro...yet you still have typical noob questions.
I have no doubt that you'll be a master grower some day soon. You have the touch.
Nute burn is somewhat related to transpiration in that as the plant draws new water upward to top leaves...it also brings nutrients. Usually you'll see not yellowing but browning and crispy tips. And sometimes along the edges.
So it sure sounds like a little food will take care of that yellowing.
JD
PS I think I met you with a lamp question...right? Just wanted to give you feedback on that. I got outbid on the Gavita de 750 but I did pick up an LED and a 315 cmh...so my plants will still get good light...