EcoBio-Block Stone Natural Volcanic Water Clarifier and Odor Remover Rock for Aquariums, Nano, 2-Pack

Unique beneficial bacteria in volcanic rock multiply to create a healthy ecosystem for clear, clean water without odors. Speeds up nitrogen cycle, with pure bacteria in spores, germinating in early, middle and late stages, only in the presence of organic waste. Reduces need for frequent maintenance by continually replenishing beneficial bacteria for up to one year. Ideal for Betta homes and all nano freshwater or marine aquariums. Safe for all fish, reptiles, amphibians and other aquatic life. Makes aquarium care simple in fresh or salt water. Nano size treats tanks from 1.5 to 3.0 gallons