Nutrafin® Cycle® Biological Aquarium Supplement

This high-concentration formula goes to work immediately to rid your aquarium of toxic ammonia and nitrites to help establish a safe environment for your fish to thrive. The all-natural formula is safe for humans and fish, and can be used in both fresh- and saltwater environments.

Regular application of this Nutrafin Cycle Biological Aquarium Supplement helps to establish and maintain a healthy and safe aquatic environment for your fish. The fast-acting formula releases beneficial bacteria that work to eliminate harmful ammonia, nitrites and undesirable bacteria from the water, so you can introduce new fish quickly. The supplement is not harmful to plants, fish or humans, so it is safe for regular use to create a biologically well-balanced aquarium.

• Releases fast-acting beneficial bacteria that help eliminate toxic ammonia, nitrites and undesirable bacteria for a healthy aquatic environment
• Safe for use in fresh- and saltwater aquariums
• Ideal for establishing safe conditions in new aquariums
• Bio-floc technology helps preserve stability, efficacy and shelf life for consistent results
• All-natural formula is not harmful to plants, fish or humans for safe use
• Does not require refrigeration
• When treating new aquariums, apply 25 mL per 10 gal. (38 L) on day 1; apply 10 mL per 10 gal. (38 L) on days 2 and 3
• After all regular maintenance activities, and as a weekly dosage, apply 5 mL per 10 gal. (38 L)
• After adding new fish and/or medicating, apply 10 mL per 10 gal. (38 L)

Available in 4-fl. oz. (118 mL), 8.5-fl. oz. (250 mL), 17-fl. oz. (500 mL) and 2.1-qt. (2 L) sizes

*See menu selections above for sizes and styles in stock and available online.