API Quick Start Freshwater and Saltwater Aquarium Nitrifying Bacteria
In a new aquarium, harmful ammonia and nitrite build up from fish waste, often resulting in fish loss or “new tank syndrome”. The unique, patented nitrifying bacteria in API Quick Start are scientifically proven to quickly consume ammonia and nitrite to help prevent fish loss. API Quick Start allows immediate addition of fish to a new freshwater or saltwater aquarium as it immediately starts the aquarium cycle. This treatment also helps to maintain an active biological filter in an established aquarium for healthy water conditions. API Quick Start contains live, nitrifying bacteria.
Use when starting an aquarium, adding fish, changing water or filter media.
Key Benefits
- Reduces harmful ammonia and nitrite levels in new tanks
- Helps prevent fish loss during the initial aquarium cycle
- Supports biological filtration in established tanks
- Ready to use — adds live nitrifying bacteria immediately
| Product Type | Nitrifying Bacteria |
|---|---|
| Application | Starts aquarium cycle, adds fish, water changes, filter media replacement |
| Compatibility | Freshwater and saltwater aquariums |
| Contains | Live, patented nitrifying bacteria |
FAQ
Can I use API Quick Start in a newly set up aquarium?
Yes, API Quick Start is designed for use in new aquariums to help establish the biological cycle quickly.
Does API Quick Start work in both freshwater and saltwater tanks?
Yes, it is formulated for both freshwater and saltwater aquariums.
How long does it take for the bacteria to start working?
The nitrifying bacteria begin to work immediately upon addition and help reduce ammonia and nitrite levels within hours.

Olivia Ince –
I used API Quick Start when setting up my new freshwater tank. The ammonia levels dropped quickly after adding the bacteria. My fish stayed healthy without any stress. It made the transition to a new tank much easier.
Zoe Manning –
After a water change, I added API Quick Start to help stabilize the filter. It helped reduce nitrite levels and kept the water conditions stable over the next few days.
Sally Ellison –
I’ve used this product in both saltwater and freshwater setups. The bacteria worked fast and helped prevent fish loss during the initial cycle. Highly recommended for new aquariums.