1ml per 10g didn't do anything for me after 3 days. I dosed into powerheads. I wanted to double that but I'm worried about burning my fishes gills and possibly nuking my snails and shrimp.Some people spot treat, I just dumped it into the overflow. You use standard 3% peroxide from the pharmacy. Start at 1 mL per 10 gallons and see how that works.