Ecological Laboratories - Nite Out II. Reef, Marine & Freshwater Safe. Bacterial Products. Treats up to 950 gallons. Nitrifying Bacteria specially formulated for rapid ammonia and nitrite reduction. Decreases Ammonia and Nitrite toxicity. Designed specifically for aquarium waters that contain marine life. Its highly-specialized microbial consortium of nitrifying cultures are specially formulated to eliminate ammonia via a natrual biological process termed nitrification. The cultures will establish, promote or stabilize and maintain nitrification in aquarium waters, eliminating the toxic effect of ammonia. This liquid nitrifying bacteria contains select strains of Nitrosomonas, Nitrospira and Nitrobacter. Nitrosomonas oxidize ammonia to nitrite and Nitrobacter and Nitrospira oxidize nitrite to nitrate. Also available in 4 oz.