Bacteria
API
Fish & Aquatic · Water Care
API
API Quick Start Nitrifying Bacteria, 16 oz
Bacteria
Best for: New tanks and after big changes
Live nitrifying bacteria that help establish the biological filter in new tanks and after filter cleaning or water changes.
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What we like
- Helps speed cycling
- Easy dosing
- Widely available
Keep in mind
- Not a guaranteed instant cycle
- Still test water
Our in-depth look
Who it's for
Anyone starting a new tank.
Tips
Keep testing ammonia and nitrite during cycling — bottled bacteria help but don't replace testing. See our first freshwater aquarium guide.
Questions owners ask
Can I add fish right away?
Test first; add fish slowly and monitor ammonia and nitrite.
Does it need refrigeration?
Store as the label directs, away from heat.
