Tetra Ick Guard is a soothing conditioner that quickly clears ick (Ichthyophthirius multiliis), or white spot, on freshwater sh. Ick is usually the result of sudden changes in the aquarium water temperature or stress. Left untreated, ick spreads rapidly and is usually fatal. Special ingredients have been added to protect sh from secondary infections.Tetra Fizz Tabs are fast dissolving premeasured tablets that make caring for your aquarium faster, easier, and more convenient.