Any tips for Canna CoCo nutrients

Sick Plants & Problems
1

Hey everyone, I’m using Canna Coco nutrients right now and am looking for some help. Anytime I get anywhere near their recommended EC I get burnt tips, but at the same time my new growth is light lime green and lower fan leaves are turning yellow on the bigger plants. There are some pink petioles. pH has been between 5.6 and 5.9 every feeding.

The setup is;
CoCo/perlite 70/30, in 3 gal fabric pots,
lights are LED (400W Vero COB + 225W Samsung mid power diodes)
6 plants; random freebie autoflowers (4 different strains((should make things more complicated))

Possibly a little overwatered? I know “you can’t overwater coco” …but I can.
Cal Mag issue? The leaf edges have been curling up a little, but the humidity has been unusually low also.
My pH tester is broken? (just calibrated it, but who knows)

I think it’s probably overwatering and too low nutrients, but I’m hesitant to bump up levels at this point. I have some CaliMagic that I could supplement.

Any thoughts?

Thanks

2

Toss up a couple pics. Some will surely know and be able help.

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I think I fugured it out. Added a little CaliMagic and upped the A+B to Canna’s “normal” feeding schedule. I had dropped the A and B way down after getting some tip burn, but I think that I may have doubled the B dose by accident. (I got a phone call when I was mixing up the nutes and couldn’t remember if I’d added it or not, so I added it again)

So I think the issues were;
A Mg deficiency that probably would have cleared up with just a+b at normal dose, but I added some CalMg anyway
and slight N deficiency

Plants are looking much better already!

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@Herbie uses those with a very high rate of success, maybe he could tell you, i know the guy is busy.