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I used the fresh water dosage I’m up to 15 gallon water change as of now- I’ll send a picture tomorrow- to see any changeHow much did you overdose?? Changes are that you need to do a series of large water changes.
I get this from the instructions: "Poly-Ox is strong and can kill inhabitants if used indiscriminately"
Yes it is dark purple- throwing away now! Thank youWhat color is the product? If it is purplish-black, then it is potassium permanganate and it is dangerous to every use in a reef tank. GAC and water changes are your best hope.
Throw the bottle away when you are done.

