Yelowing leaves + clawing... (Pics)

Ok heres my problem, the leaves on the plant look to have nute burn ? But i dont see why as im in my second week of flowering and only just got to 1.6 EC ?

if you need and more info just ask please,

Nutes = Canna A+B


Here's the pics:

Whats the PH of the water you are using? If hydro, whats the PH of your nutrient solution/tank? Need moar details bro, but it does look like burn...

ph is 5.7 DWC Sep up

Could be a root system issue. Roots are damaged and not taking up trace elements and K. If its not getting any K it will die in short time so fix it asap.

yeah give us some pics of the reservoir and root system...how does she look? You using anything like H2O2 in there?