Need serious help!

I'm using canna coco nutes used ionic nutes before with no problems

The lower leaves look brighter also I'm currently feeding them with an ec of between 1 and 1.2 and ph of 5.8
My water ec is currently 0.6

I'm using canna a+b rhizatonic and cannazym

I think it need more cal-mag.

The 3rd pic shows the leaves have something goin on around the edge. Isnt that beginning of mag def?

nutrient toxicity - flush plant for one week - readjust amounts of nutrients and x's feeding per week - stage of growth ? PH is OK. Cal-mag over use is a very common issue that many cultivator have. for a to low of is impossible; think about it ? your nutrients have some "n" in them. Pleasse not trying to be smart. also there is a chart/with picture's here on site about plant issues