Aquascape Parasite & Ich Treatment is used for the treatment of external protozoan parasites including ich, costia and trichodenella. It is important to treat immediately after noticing the first signs of a parasite problem on your pond fish. Common symptoms include fish quickly rubbing or flashing against surfaces within the pond, or white spots that look like grains of salt or larger stuck to the surface of the fish. Common issues that should be avoided include water temperature fluctuation, poor water quality and/or fish stress. This product is not available for sale or distribution in the state of California.