Quick Cure is a aquarium medication that can be used treat common aquarium parasites, including ick, protozoans, flukes, costia, chilodonella and trichodina. While it is safe for most freshwater and saltwater fish, it should not be used with invertebrates such as snails and shrimp because it's formulated from formalin and malachite green. Quick Cure can also discolor silicone in glass aquariums.