API Stress Zyme Water Conditioner 1 GalAPI Stress Zyme Water Conditioner The API Stress Zyme Water Conditioner helps improve the development of the biological filter, and also helps clean the water in the aquarium. This conditioner comes with over 300 million live bacteria per teaspoonful. The conditioner breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels. Continuous use assures an active biological filter, cleaner