Fritz Aquatics FritzZyme 7 Aquarium Bacteria, 946 ml 2-Pack for Biofilter Support

Fritz Aquatics FritzZyme 7 is a live nitrifying bacteria treatment designed to reduce ammonia and nitrite in freshwater aquariums; this pack contains 32 ounces and comes as a 2-pack.

• Live, species-specific nitrifying bacteria — helps quickly reduce toxic ammonia and nitrite.
• For freshwater and brackish water systems — supports aquarium care across both types of water.
• For new and established aquariums — helps establish or reinforce the biofilter.
• Buffered for long-term stability — needs no refrigeration and has a one-year shelf life.
• Use after maintenance or system changes — supports biofilter stability when aquarium conditions are disturbed.

Ammonia and nitrite can build up during aquarium cycling or after changes to a tank’s routine. FritzZyme 7 is made for aquarists establishing a biofilter in a new aquarium and for maintaining biological filtration in an established system. Its live bacteria are intended to help shorten cycling time and reduce fish loss, while also supporting the biofilter after maintenance and other changes.

How does FritzZyme 7 support aquarium cycling?

FritzZyme 7 supplies live nitrifying bacteria that help reduce ammonia and nitrite as a biofilter becomes established. It is made for both new tanks that need a biofilter and established aquariums where biological filtration needs reinforcement. The product is designed to significantly reduce cycle time and fish loss.

• Supports biofilter establishment in new aquariums.
• Helps reinforce biological filtration in established systems.

Can FritzZyme 7 be used in freshwater and brackish aquariums?

Yes. FritzZyme 7 is intended for freshwater and brackish water systems. Its use is not limited to starting a new tank: it is also made for supporting the biofilter following changes to an established aquarium.

• Suitable for freshwater systems.
• Suitable for brackish water systems.

When is FritzZyme 7 useful during aquarium care?

Use it as a biofilter-support product after maintenance, water changes, aggressive cleaning, adding new livestock, or changing filter media. These situations can disturb an aquarium system, so the product is intended to help reinforce the biofilter and support ongoing stability.

• For use after water changes or aggressive cleaning.
• For aquarium changes that include new livestock or filter media.

Fritz Aquatics has continuously produced and developed FritzZyme 7 for more than 30 years for professional and home aquarium use. The bacteria are buffered for long-term stability, so refrigeration is not needed; the product has a one-year shelf life. The 32-ounce, 2-pack suits aquarists who want a bacteria treatment for cycling a new freshwater or brackish system and for supporting a biofilter after routine or more substantial changes. Its live nitrifying bacteria are designed for aquarium biofilter support, not as a substitute for aquarium maintenance.