I can't comment on your problem, but as I also grow in coco and use canna nutes I have noticed a couple of things you need to be aware of.

The PH range for coco is 5.8 to 6.3 (I aim for 5.8/5.9). My local grow shop also recommends that if you are using hydro nutes in coco, feed at 3/4 strength (this has worked fine for me, if a shop tells me to use less of something that they are selling me I am inclined to believe them - they also have a great reputation for good advice).

:hippy:
PhatJay Reviewed by PhatJay on . Advice needed please possibly plant problem. I used to grow last year and i used rockwool and had no problems for a few grows. I've just started a grow and i thought i'd give cocoponics a go..I just noticed one of my plants has a lightening green band on one of the lower leaves and the bottom set of leaves on most of the plants have twisted quite bad!!! I think i've overferted them as i've been given them weal nutes every feed once a day. i would like your opinion please so i can nip this problem in the bud..otherwise these plants Rating: 5