Hiya, iv been growing 13 yrs, still make mistakes, still learn every crop. I think your canna nutes should be ok, There may be a bit too much magnesium and calcium but if you have the ph a little higher than for hydro, say 6.3, it should make these ellements less available. Theres loads of info on the net, have a look around. The soil should be ok too, i used to use tomato bags, then changed to Jhon Inings No 3, had good results. You can get ph metors for soil that are cheap and at some garden centres, there realy usefull. When i started my main probs were too much heat and over feeding. I found that sick plants ofter do well if there re poted, as big a pot as pos. Good look