Here is an answer from the maker of the product as far as storing it in next to the ATO:
Our recommendation to store NP-BACTO-BALANCE in a dark and cool place is a precaution because this product might get growth of fungal spores when diluted, and stored opened in a warm and bright place. But it does not have to be – if the container in your ATO is mostly closed, not too bright we would not expect problems. At the end it is also the question how long you would use one bottle of NP-BACTO-BALANCE.
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