BAPI Stress Zyme, 16-Ounce ReviewbP PP API Stress Zyme, 16-Ounce PImproves the development of the biological filter and helps clean a dirty aquariumPHelps clean a dirty aquariumPHelps prevent dangerous conditions such as ammonia and nitrite poisoning and low oxygen levelsPAssures an active biological filter, cleaner aquarium, healthier fish and good water qualityP16 oz.