Advice please, yellowing on leaves

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Severance

Severance

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This plant is outside (summer here) about 3 months old, and has this yellow coloration for the last few weeks. Before I take an amateur guess at mag deficiency or something, I'd appreciate any advice or suggestions.

About 2 weeks ago I up-potted it to this 20 gallon fabric bag. The bottom 3rd of the bag is amended medium, above that the plant is in straight Canna Terra Pro potting mix.

Water is rain water, soft, pH usually around 5.2 to 5.4 though I haven't been pH-ing with this, I'm trying an organic approach without it.
If just watering, I add 2 drops per litre of liquid seaweed extract, which raises the pH of the water a bit.

Aside from what's in the potting mix, it's been lightly fed with liquid guano concentrate (10.10.2) and seaweed extract.

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