Tetra Goldfish Aquasafe creates ideal water for goldfish by removing harmful compounds from tap water and adding beneficial substances. Add to new tap water at a rate of 5ml per 10litres (2gallons) to make it safe prior to adding it to the aquarium. AquaSafe can also be added directly to the aquarium at the same dosage to act as a general stress-reliever. This is especially helpful for new fish following maintenance or when treating the fish for a disease. When preparing water for water changes it is best to treat it with AquaSafe in a bucket beforehand and use boiled tap water to warm it to the same temperature as the aquarium. Also available in 250ml.