API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 16-Ounce Bottle

Works well! A bottle will last you a very long time so it has a great value for money. A very big bottle. Got the water clean and ready very quickly. Although I do still let mine cycle for up to a week before adding a new fish.

this definitely helped cycle my tank super quickly i really recommend this as someone who struggled with cycling tanks a lot. i gave up so many times and sold everything and then rebought stuff again like a year later and i had gotten this and it cycled my tank in literally like a week- that's crazy to me the ammonia levels were on point i used dr tim's droplets the water ph levels and everything else was very good! it kept the water super clean too (idk if that was this particularly or not) but it's an amazing product and it's really not that expensive! it's super easy to use as long as you follow the directions and it's very accurate at being a quick start!

I use them when starting up a new tank or even after a significant water change if I'm running late (me and my wife work 52 hours a week/14 hour days). Works fantastic just like all their products. This is a must have you just can't wait for a tank to cycle or your worried about un-balanced aquariums after huge water changes. Put it in and everything goes exactly as if should. Everyone should have some of this in their fish cabinet/container 100%!!!

The API QUICK START is an absolute game-changer for setting up and maintaining a healthy aquarium, both freshwater and saltwater. It works quickly to establish beneficial bacteria and helps to eliminate harmful toxins.I’ve used it for both my freshwater and saltwater tanks, and it’s been a huge help in keeping the water clean and the fish happy. Highly recommend this product to any aquarium owner looking for an easy, effective way to get their tank started right.

Have used Quick Start on two tanks now, one 10 gallon and one 45 gallon. The product works, BUT it has to be used in the right way (which isn't the one printed on the back label.)The first time I used it on the 10 gallon was my first time setting up an aquarium, and I pretty much just dumped the recommended dosage in along with conditioner/stress zyme, then put in fish the next day. After about a week or two my ammonia levels spiked hard, then another one to two weeks or so after that my nitrites and nitrates started to spike. Ended up losing 50% of my fish before the cycle finally stabilized (the remainder have survived over a year now).The problem is that the cycle needs ammonia to start, and a brand new tank will not have any, nor does Quick Start contain ammonia. Therefore, if you just dump it into a new tank, then put in fish, the cycle will not start until the fish food/waste starts to decompose into ammonia, which can take a week or more. Once sufficient ammonia is present in the tank (3-5ppm), it takes about another week or two for the bacteria to then break it down to nitrites and then nitrates, completing the cycle. During this time your fish will be suffering high ammonia and nitrite levels, even with frequent water changes.To properly cycle your tank with Quick Start, you need to introduce ammonia into the water quickly and without fish. The "natural" and slower way to do this is to put biomass into the tank and wait for it to rot. This can be store bought fish (not live), shrimp, fish pellets/flakes, etc. However, these take time to decay. The faster way to introduce ammonia is to directly buy a bottle of liquid ammonia designed for cycling aquariums, and put in enough to reach 4-5ppm. Then immediately add API Quick Start, along with any conditioner/etc. After about a week or so you'll notice the ammonia levels go down, and nitrites start spiking. After another few days the nitrites and ammonia will both go down close to or at 0, and nitrates will be present. Now the tank is fully cycled, and it's safe to add fish.

My filter quit over night, and half my media dried up. Of course, I got spikes, as I had JUST added new fish a few days prior. API will help me get this tank cycled again, and save my fish. I use it in new tanks as well!

Great product