Search: Masterblend high quality newts at a very reasonable price Jack's and as mentioned above Mega crop are other fine optionstill having problems.
earth worm castings in the coco may be causing pH swings.
i noticed the mixed canna nutrients form an ice on the top of water jug (i dont like that)
i went to the hydro store yesterday and discussed, wanted to switch to botanicare nutes, unfortunitely spent another $75 on canna only to have them look like crap after yet another watering.
I'm not a Coco grow or and try to stay out of Coco spreads but I'll re-read this thread when I get a moment and see if I can see anything that might stand out that might help you;
How old is this picture and when did this start?