Ammo-Chips Ammonia Remover Continuously Removes Ammonia From New Or Established Freshwater Aquariums. Ammonia is the #1 killer of tropical fish. Works with any filter. Fully rechargeable so you can use again and again. Use 1/4 cup for each 10 gallons of water. For goldfish bowls, use 2 tbsp. for each goldfish. 12 Oz.