API Stress Coat is an essential water conditioner for any aquarium owner. It is a multi-purpose product which is scientifically proven to help relieve fish of stress, as well as help to restore tissue damage. Stress Coat works by forming a synthetic slime coating around the fish, helping to replace the natural secretion of slime produced by fish. This can often be halted by stressful situations, leaving the fish more vulnerable to disease and infection. It is a multi-purpose solution which also helps to remove ammonia, chlorine and chloramines from tap water. It is advised that this product is used when adding new fish, during water changes, or when beginning a new aquarium. Available in 118ml, 237ml, 473ml and 1.9 litre sizes.