Ok I now know I have a Phosphate deficiency. All the plants I've ever seen had some purple on the stems, I thought it was normal, turns out(as you most likely already know) it's not normal. I'm glad I figured this out now so I didn't have to wait for another feed. I found mite eggs on two of my smaller NL, and I'm already over my limit of 8 and want to start playing with clones soon so I think we will say goodbye tonight , because all the other leaves are clear of mites and I don't want to risk reintroducing them.