I'm growing in Coco :P i tried taking pics but it wouldn't show up, I think I caught it just before it got to the worse end. The progression of the lighter spots stopped after I added calmax and brought the ph higher up to around 6. this is currently what my nodes look like:
[attachment=o230172]
but i have to be careful, the runoff was a little low again so i think i have to redo the ph of my solution