Alright, I've got 1 of my 2 canisters running in a Rubbermaid tub with tank water to keep bacteria alive. My other canister is running with no media strictly for water circulation. All fish and decorations are out, with just some of the gravel remaining. I just did a full water change with untreated tap water and added 64 oz. of hydrogen peroxide about an hour ago. How long should I leave the peroxide in before changing the water again and adding Excel? The algae seems to be weakening, starting to come off the glass easier.
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