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FritzZyme® 9 contains live saltwater-specific strains of live nitrifying bacteria proven to reduce fish loss due to toxic levels of ammonia and nitrite. Nitrifying bacteria can take weeks to naturally establish colonies in new aquariums while ammonia and nitrite can reach lethal levels in only a few days. FritzZyme 9 provides bacteria proven to rapidly seed biofilters, greatly reducing the natural cycle time allowing for safe, faster addition of livestock.
Only true nitrifying bacteria can cycle an aquarium. FritzZyme 9 contains live, aquarium-proven strains—carefully buffered for stability so they’re alive and effective when you add them.
From beginners to world-class public aquariums, aquarists rely on FritzZyme to keep aquatic life safe and thriving.
Fritz was the first to commercially produce live nitrifying bacteria for aquariums—and has been leading the way ever since with continuous innovation and quality.
It’s all about the nitrogen cycle and how long it takes.
FritzZyme 9 Live Nitrifying Bacteria provides the species of saltwater-specific bacteria proven to rapidly seed biofilters. Since the bio-filter is established immediately, ammonia and nitrite remain at safe levels during the nitrogen cycle.**
Without an established biofilter, ammonia and nitrite levels can reach toxic levels in only a few days while the nitrogen cycle may take up to several weeks.
*Cycle time can vary depending on amount of livestock, feeding and other factors. Graphs are for illustrative purposes only. **Nitrate is removed from aquariums by regular water changes.
Remove chlorine and chloramines with a water conditioner prior to adding FritzZyme 9.
Discontinue use of UV sterilizers (if present) prior to and 4 days after each application.
Shake well, add directly to aquarium
Add livestock within 24 hours, do not overstock or overfeed
Monitor ammonia and nitrite levels daily
Add 4 oz (119 mL / ½ cup) per 5 US gallons (19 L)
Repeat dosing is not required. To decrease cycling time or for larger stock levels, dose may be increased up to 10x or repeated as desired. Consult the Ideal Parameters table if cycling time is not progressing as expected.
Add 1 oz (30 mL) per 5 US gallons (19 L)
Maintenance dose may be applied as needed, such as when adding new livestock, replacing filter media, or after using medications.
FritzZyme 9 is a live product, do not freeze or overheat. Store in a cool, dark place until ready to use.
Use FritzZyme 9 before the expiration date on the package to ensure viability.
Variations of odor and color between bottles is normal. Lack of odor or a strong odor does not mean the bacteria are dead.
For a large livestock system or systems with heavy bioload, new system dosage may be safely increased up to 10x.
For the most accurate dosing, use the total water volume of your entire system — including sumps — less any displacement from substrate, rocks, and decorations. Note that some imperial measurements are rounded to the nearest common measure for ease of use.
Like any other living organism, FritzZyme bacteria will thrive and perform the best in the right environment. Outside of the ranges below, performance may slow.
Parameter | Range | Notes |
|---|---|---|
Temperature | 77-86° F (25-30° C) | |
pH | 7.3 – 8.0 | Nitrification is inhibited below 6.0 |
Salinity | 0 — 6 ppt (1.000 to 1.0045 sg) | Active up to 15 ppt (1.011 sg) |
Alkalinity (KH) | minimum 4.5 dKH or 80.5 ppm KH | |
Phosphate | above 0 ppm | Low phosphate can stall nitrite to nitrate conversion |
FritzZyme is compatible with all freshwater species, equipment and most Fritz products, see below for details.
Species | Compatible? | |
|---|---|---|
 | Saltwater fish |  Yes |
| All corals: LPS, SPS, soft corals | Yes |
| Starfish and other invertebrates | Yes |
| Macroalgae | Yes |
Equipment / Products | Compatible? | Notes | |
|---|---|---|---|
| Fritz water conditioners | Yes | |
| UV Sterilizers |  Yes, 4 days after dose | Discontinue use of UV sterilizers prior to and 4 days after each application. |
| Treatments / Medications | May need to re-dose | FritzZyme won’t affect medications, but medications may affect beneficial bacteria. Always monitor water quality and re-dose FritzZyme after treatment to restore biological filtration. |
Ask our experts, we’re here to help!
| Item # | Size | Treats up to | Case QTY | UPC |
|---|---|---|---|---|
| 75080203 | 8 oz (237 mL) | 40 US gallons (151 L) | 12 | 080531802038 |
| 75080204 | 16oz (473 mL) | 80 gallons (302 L) | 12 | 080531802045 |
| 75080205 | 32 oz (946 mL) | 160 US gallons (604 L) | 12 | 080531802052 |
| 75080213 | 64 oz (1.9 L) | 320 US gallons (1,208 L) | 1 | 080531802137 |
| 75080206 | 1 gallon (3.78 L) | 640 US gallons (2,423 L) | 1 | 080531802069 |
