API Quick Start

$5.83 ~~$7.99~~ In stock

API QUICK START nitrifying bacteria allows for the instant addition of fish, as it immediately starts the natural aquarium cycle with beneficial bacteria, which converts toxic ammonia into nitrite, then into harmless nitrate to help prevent fish loss in your tank. Best for use when starting a new aquarium, after water changes and filter changes, and when adding new fish to an existing aquarium. API QUICK START nitrifying bacteria may be used in both fresh and saltwater aquariums.

Sizes:

118ml
237ml
473ml

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Customer Reviews (5.0 / 5 · 4 reviews)

Joshua ★★★★★ Oct 21, 2026

I was skeptical about adding fish the same day I set up the tank, but after dosing this bacteria starter and testing the water 24 hours later, ammonia and nitrite were undetectable. My guppies have been swimming happily for a week now with no issues.

Aurora S. ★★★★★ Oct 20, 2026

Set up a new tank last weekend and added fish the same day—no waiting. The water tested clear today and my mollies are active and eating well. Saved me at least a month of cycling time.

Victoria ★★★★★ Oct 19, 2026

I was nervous about cycling a tank from scratch, but this stuff made the process feel almost too easy. The bacteria conversion from ammonia to nitrite happened within a couple days, and my fish were swimming around stress-free the whole time.