Fritz Aquatics FritzZyme 7 Nitrifying Bacteria, 32 oz

FritzZyme 7 is a live nitrifying bacteria product from Fritz Aquatics for freshwater and brackish water systems. It contains species-specific strains that reduce ammonia and nitrite, the two toxins that kill fish in new or disturbed tanks. This is the 32 oz bottle.

When to use it

• Starting a new aquarium
• After water changes or aggressive cleaning
• When adding new livestock
• When changing filter media
• After any disturbance to the biofilter, such as a medication course

Storage

Fritz says the product is buffered for long-term stability, needs no refrigeration and has a one year shelf life. That makes it easier to keep a bottle on hand for emergencies than products that must be chilled. Check the date before use.

Fishless cycling with Fritz

Many keepers pair FritzZyme 7 with Fritz Fishless Fuel. Dose the ammonia source and the bacteria, then test every couple of days. The tank is ready when ammonia and nitrite drop to zero within about a day of dosing ammonia. That approach builds the colony without exposing fish to toxins.

Using it with fish in the tank

If fish are already in, add only a few at first, feed lightly and test ammonia and nitrite often. Bacteria help, but the fish load must match what the filter can handle.

Shake and dose

Shake the bottle, dechlorinate first (chlorine kills bacteria), and add the dose near the filter intake so bacteria reach the media. Turn off any UV sterilizer for a while after dosing.

Why the 32 oz size

The large bottle suits bigger tanks, multiple aquariums or fish rooms. For a single small tank, a smaller bottle avoids waste.

Saltwater?

This is the freshwater formula, also usable in brackish systems. Saltwater tanks need a marine strain, such as MICROBE-LIFT Nite-Out II, which is labeled for reef tanks.