API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 4-Ounce Bottle

I’ve been keeping freshwater fish tanks for five years now I do use API a lot more than some other companies because for my needs it does a great job. You can rely on a PI to deliver, and if there is any problem, you can contact the company they have pretty good Customer service. They too are enthusiasts in the hobby and also lifestyle, but they also understand that sometimes things go wrong. In my opinion, API is a great company. I would love to do some YouTube videos and maybe they would sponsor me.

Works as advertised, arrived quickly and damage free. Will purchase again

Works great

Awesome for fish tank, works great. Glad I get it from Amazon, so much cheaper than pet stores.

I needed to do a MAJOR clean and overhaul of the primary water filter in my 75 gal tank. I was confident doing so would throw off the beneficial bacterias that filter the water and prevent toxic buildup of nitrates, etc. I read a number of reviews that recommended this product for when water changes were done, not just new tank setups. I can say that after thoroughly cleaning and replacing parts of the filtering system, changing water (25%), and applying this product per instructions on the bottle, my fish and plants showed zero stress and my chemical water parameters testing kit over 2 days showed perfect levels. So it must work, right?

Good product with cheap price

This product is effective at initiating new tanks with a minimum of 1-2 fishes before adding more. Patience is key with a reliable water test kit.

The API QUICK START for freshwater and saltwater aquariums is a total game-changer—especially if you're setting up a new tank or adding fish to an existing one. It makes the nitrogen cycle process way less stressful, both for you and your fish. I used it when starting a new freshwater setup, and within 24 hours my tank was safe and stable. No ammonia spikes, no nitrite issues—it genuinely helps establish the biological filter FAST. It's also great to use after water changes, adding new fish, or cleaning the filter. What I love is that it’s super easy to use—just shake and pour. The bottle gives clear instructions, and the results speak for themselves. My fish were active and healthy from day one. This is one of those products you always want on hand. It helps create a healthy environment and gives peace of mind whether you're a beginner or a seasoned aquarist.

Its good to rapidly reduce ammonia

Highly effective Improves water quality by maintaining bacterial colonies Easy to use... Rather than other products. Must to stepup a new tank.. also it is good to add once in month so replenish the bacterial colonies

Good

This is such a great product for aquarium set ups, at the start up or clean up stage. I've used it to cycle my 3 gallon tank for a single betta. Very convenient to use and quality of aquarium water is clear and clean. I'm using a sponge filter with API Quick Start - I add some to my tank water according to the instructions, every time I clean the aquarium. It's working well for me to date.

Great price quality first class