I think I've been over feeding for a while. I'm using canna terra professional which looks to be similar to biobizz All Mix - but I've been using 2ml grow from week 3-4 and then 3ml from week 5. But by the looks of it should have been on 1ml.
I meant to say Cal/mag not cake mag
With the extra nutrients I'm thinking I should flush with plain water once then start back with 1ml of grow per litre.
Does that sound right?