Ammonia levels will rise naturally due to the accumulation of fish waste and the breakdown of any uneaten food in water. Harmful ammonia is neutralized and tap water is conditioned for fish after a single dose of Aqueon Ammonia Neutralizer. Also acts as a water conditioner, neutralizing chlorine and chloramines. For freshwater and saltwater aquariums. Neutralizes harmful ammonia and nitrites that can build up in aquarium water. To reduce ammonia build-up, avoid overcrowding or overfeeding and perform regular partial water changes. Convenient dosage cap is included - Add 5mL (1 tsp) per 10 gallons of water