Stree Zyme adds beneficial bacteria to break down and consume organic matter to help keep the aquarium clean The formula contains over 300 million live bacteria per teaspoonful, all uniquely suited to consume aquarium sludge, and keep the gravel clean Stress Zyme also breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels Making Stress Zyme a part of regular care assures an active biological filter, cleaner aquarium, healthier fish and good water quality It is ideal for use in fresh and saltwater