FritzZyme 9 Saltwater Live Nitrifying Bacteria
FritzZyme 9 is formulated with unique strains of live nitrifying bacteria, designed to effectively lower fish mortality caused by harmful ammonia and nitrite levels in saltwater aquariums.
Usage Guidelines
- For new setups: Apply 4 oz (119 ml / ½ cup) for every 5 US gallons (19 L). In systems with heavy livestock, you can safely increase the initial dose up to 10 times.
- For maintained systems: Use 2 oz (60 ml / ¼ cup) per 5 US gallons (19 L).
- This is a live product and should not be frozen.
| Application Rate | Volume | Water Volume |
|---|---|---|
| New Setup | 4 oz (119 ml / ½ cup) | 5 US gallons (19 L) |
| Maintained System | 2 oz (60 ml / ¼ cup) | 5 US gallons (19 L) |
FAQ
Can I use FritzZyme 9 in a new saltwater aquarium?
Yes, you can use FritzZyme 9 in a new saltwater aquarium. For a new setup, apply 4 oz (119 ml / ½ cup) per 5 US gallons (19 L). In systems with heavy livestock, the initial dose can be increased up to 10 times.
How often should I add FritzZyme 9 to my aquarium?
For maintained systems, use 2 oz (60 ml / ¼ cup) per 5 US gallons (19 L) every few months, depending on fish load and water conditions. Follow the dosage based on your aquarium’s stability and bioload.
Can I freeze FritzZyme 9 to store it longer?
Please contact customer service

Wendy Gray –
I added FritzZyme 9 to my 20-gallon saltwater tank after a water change. The ammonia levels dropped within a week, and my fish seemed more active. It’s easy to use and works well with my existing setup.
Lucas Stewart –
Used it in a new tank with a lot of fish. Followed the dosage for heavy livestock and saw a noticeable improvement in water quality within a few days. The bacteria seem to establish quickly.
Oliver Payne –
After switching from a chemical filter to biological filtration, I used FritzZyme 9 to help stabilize the nitrogen cycle. My tank has been stable for over two months now with no fish deaths.