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18/6 would be more healthy for your plant, however, it does look like a cal/mag issue.
I would also be lowering the humidity, just to be on the safe side.
You need to feed some Calmag!
I can recommend Biobizz Calmag - just ad 1ml into 1l of water and feed your plant like usual. You can still add nutrients to your Calmag water.