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Add ⅕ teaspoon for each 10 U.S. gallons or 1 teaspoon for each 50 U.S. gallons of aquarium water. Repeat dose every 3 days until algae is controlled. Siphon or scrape any dead algae from the aquarium. Once algal growth is under control add 1 dose per week. Weekly doses of ALGAEFIX will control algal growth and reduce aquarium maintenance.