KORDON 96032 Rid Fungus Natural Disease Treatment, 4-Ounce External fungal disease treatment. Easy to use - 100% natural ingredients. Halts infections and parasitic invasions. Does not interfere with biological cycle. Will not harm invertebrates (snails, shrimps, crabs, coral, anemones etc.) Is effective against fungus (Saprolegnia & Achlya) Safe for reefs and live rock.