Tetra Fungus Guard quickly and safely clears fungus and bacteria-related conditions on tropical fish and goldfish. Protects against secondary infections. Tetra Fizz Tablets are dissolving, pre-measured tablets that make caring for aquariums fast, easy and more convenient than other brands of tablets and capsules. As a tablet is dropped into an aquarium, the fizzing action assures you that it's working immediately and dispersing its ingredients throughout the aquarium. Each tablet treats 10 gallons of water.