Kordon Ich-Attack is an herbal treatment with multiple natural ingredients for elimination of external single-celled infections of fishes - whether protozoan parasites (amebae, ciliates or dinoflagellates), or fungal. The herbal formula is based on the unique use of patented naphthoquinones exclusively used by Kordon as the basic ingredients. Ich Attack has a broad spectrum of activity, lessening the necessity for detailed, accurate dosing. Ich Attack particularly directed against all external protozoan infections, including white spot disease (Ich) and as an effective external treatment of protozoans, dinoflagellates, and fungi. Equally effective in fresh and salt water - does not require water changes between treatments. SAFE FOR REEFS and LIVE ROCK. Safe for use with aquatic invertebrates (snails, shrimp, crabs, coral, anemones, etc.) Does not interfere with the biological cycle. 4 ounce bottle treats up to 240 gallons.