Still waiting on water Halo be here tomorrow then yes, I have been giving 75% canna a b only and cal mag full, today the first time I added root tonic, tonight I'm filling tank and get water conditions correct for tomorrow feed, I been flat out so struggling a bit, one plat the worst the others tipping
slight tipping only is ok and shows your about right for nute levels. when it's with edging going there's other issues. it's normally associated with flip and a higher pk ask. it's potassium showing.
could be you just have one heavier feeder.
edit : consult your canna feed schedule. it's a bit different than other nutes. your ec will depend on that and feeding frequency if automated because drain to waste.