Apparently some salts contain a little Nitrates in them or even if you are just using tap water...
but if your using RO I Don't think anything will happen to it....I leave my made up water for a week or so before I add it to the tank and I have never seen any effects from it sitting their!!
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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