FritzZyme 7 is a live nitrifying bacteria specifically formulated for freshwater aquariums. Add it to a brand-new tank or any system that needs a biological boost — the live bacteria seed your biofilter, removing toxic ammonia and nitrite so livestock can be added safely. Pair it with the Fritz 6-in-1 Test Strips to monitor your cycle, and browse our full aquarium additives & supplements selection.
Why Choose FritzZyme 7
- True nitrifying bacteria— the actual species used by professional zoos, public aquariums, universities, and aquaculture facilities.
- Quickly removes ammonia and nitritefrom new and established tanks, reducing fish loss during cycling.
- Safe for new tanks and existing systems— no risk to fish, plants, or invertebrates.
- Freshwater-specific strainsfor community tanks, planted aquariums, goldfish bowls, and ponds.
- 30+ years of proven success— Fritz Aquatics was the first company to commercially produce nitrifying bacteria for the aquarium hobby.
- Made in the USAby Fritz Aquatics.
When to Use
Add FritzZyme 7 any time the biofilter needs fortification:
- New tank setup— dose before adding livestock to seed the biofilter.
- After water changes— especially large changes that may stress the colony.
- After filter cleaning— aggressive scrubbing can knock back beneficial bacteria.
- Adding new livestock— supports the bioload increase before ammonia spikes.
- During or after medication— some treatments harm nitrifying bacteria.
- When changing filter media— reseed the bacterial colony immediately.
How to Dose
- Shake the bottle vigorously to suspend the live bacteria.
- Add the dose directly to the aquarium near a flow source so it disperses through the system.
- Follow the dosing instructions printed on the bottle for your tank size.
- Test ammonia and nitrite during cycling and be patient — standard FritzZyme 7 cycles a tank in roughly two to three weeks. For a 5-day cycle, use the 15×-concentrated FritzZyme TurboStart 700 instead.
- Avoid running UV sterilizers or ozone for 24 hours after dosing; both can kill the bacteria before they colonize.
FritzZyme 7 vs. TurboStart 700
| FritzZyme 7 | Standard concentration — best value for routine maintenance dosing. |
| FritzZyme TurboStart 700 | 15× more concentrated — cycles a brand-new tank in 5 days or less. |
Specifications
| Brand | Fritz Aquatics |
| Product Type | Live nitrifying bacteria — freshwater |
| Use With | Freshwater aquariums, planted tanks, ponds |
| Available Sizes | 8 oz, 16 oz, 32 oz, and 1 Gallon |
| Storage | Cool, dark place — do not freeze |
| Made In | USA |
Recommended Pairings
- Fritz 6-in-1 Test Strips — monitor ammonia and nitrite during cycling.
- Fritz Master Test Kit — confirm strip readings to the parts-per-million with liquid drop tests.
- Fritz Complete Water Conditioner — detoxify chlorine, chloramine, and ammonia before adding livestock.
- FritzZyme TurboStart 700 — the 15×-concentrated version for fast new-tank cycling.
- Browse all Fritz Aquatics products at Squeaky’s Aquatics.
FAQ
How quickly will FritzZyme 7 cycle a new tank?
Standard FritzZyme 7 cycles a tank in roughly 2–3 weeks. For an instant cycle (5 days or less), use the 15×-concentrated TurboStart 700 instead.
Will it work in saltwater?
No — FritzZyme 7 is freshwater-specific. Fritz makes a saltwater version (FritzZyme 9) for marine systems.
Do I need to turn off my UV sterilizer?
Yes — turn off UV, ozone, and any chemical filtration (carbon, Purigen) for 24–48 hours after dosing so the bacteria can colonize the biofilter.
Does it expire?
Yes — the bottle has a printed expiration date. Live bacteria gradually lose viability, especially when stored warm. Buy the size your tank will use within the freshness window and store cool.
Is it safe with sensitive fish, plants, or shrimp?
Yes. FritzZyme 7 is non-toxic to fish, plants, snails, and shrimp at any reasonable dose.
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