Safe for koi and goldfish. Non-toxic to plants and biological filters when used as directed.
Most fish parasites are too small to be seen without the aid of a microscope.
Parasitic infestation can nevertheless be detected by observing certain unusual behaviors in pond fish. Because parasites often attack the gill area and interfere with fish respiration, parasitized pond fish can be seen to either sit motionless on the pond bottom, or hang near the surface at waterfalls or fountains. Fish exhibiting this behavior can suffocate due to gill damage if not treated promptly. External parasites can also irritate the skin of fish, causing damage that may lead to secondary bacterial and fungal infections of the body and tail. Before using any pond medication, be sure to remove any activated carbon from your filter system, as the carbon will filter the medication out of the water.