Aquascape Fungus Treatment is used for the treatment of fungus, external protozoan parasites including ich, costia and trichodenella. It is important to treat immediately after noticing the first signs of fungus or a parasite problem on your pond fish. Common symptoms include white, green or grey cottony looking patches, 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 quailty and/or fish stress. This product is not available for sale or distribution in the state of California.