i ve been using canna for a lil while now...Go to their site to get a feed chart..
Use RO or distilled water so the ph buffers will work properly.But u must monitor that ph cause it rises and youll run into trouble.
Ususally start off with 4-6 ml VEGA. 400-550ppm
I ran into the pH issue during veg. Got some nasty pythium and roots browned almost overnight. Do you add anything else? I use reg tap water and balance the pH before fliling the rez then once the nutes are there I go back and balance it again.