Kordon for kids – Bettas tabs – just drop in a single color coded tablet! instant water conditioner. Nothing for little hands to spill. Easy for kids – nothing to measure. Fill out how much water to treat: fill bow or aquarium using measuring cups or clean soda bottle – something that already has measurements and amounts marked on it. 64 ounces = 1/2 gallon, 128 ounces = 1 gallon. Drop in the tablet: package will tell how many gallons of water will be treated. Watch the tablet dissolve: starts fizzing immediately-making the water safe as soon as tablet is added to the aquarium or terrarium habitat. For water changes, new water can be prepared ahead of time. Set of four Betta 1 gallon size tablets.