API® GOLDFISH AQUARIUM CLEANER makes cleaning your goldfish tank simple and easy! This product helps keep gravel clean and removes organic sludge, working naturally to break down solid fish waste. It also helps reduce toxic ammonia and nitrite by boosting the biological filter in established aquariums. We recommend using this product weekly and with all water changes for a clean & healthy tank.
Add 1 ml. for each 0.5 gallon or 5 ml for each 2 gallons of aquarium water