PH Question

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No3 is at 5. As I've previously posted I have a 5" Yellow head goby that I will trap and get rid of shortly, if someone wants him I would like to trade for corals.

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I am vodka dosing, but I was interested to find out about the link from frozen food to excessive No3. I was aware of to a degree, but I almost exclusively feed frozen. I wonder what people prefer as alternatives aside from making their own because I'd rather not have to.