Cal? Phos? both?

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Hi guys- I'd love to get your thoughts on this deficiency I've got on my grow here. This is day 45 of my second grow in a 4x4 living soil coot's mix- I used the take and bake kit from BaS and sourced the compost/peat/etc locally. My first grow also showed bits of this but it was not nearly as pronounced as what you see here. I've had people give me a whole range of possible explanations, but as you all know it can be difficult when many symptoms can present similarly. My first thought was Cal, but the deficiency started in the older leaves which I read is atypical for a cal deficiency. Having now looked at deficiency guide here, I'm thinking Phosphorous might actually be my problem... Is it odd that one half of the plant seems much more affected than the other, which looks pretty healthy?

Any thoughts/suggestions? Should I try and add anything at this point or just ride it out? Thanks!
 

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