The 10 Best Fish Tank Water Conditioners

“Loved it! Would recommend. I always get nervous about making sure the water is in good shape before adding/putting fish back in after cleaning. So far so good with this! I’ve been using this on my 3 gallon tank with a couple of goldfish in it and they seem as happy as can be. Will definitely buy again. [Received as part of a promotion].”

“Amazing Product! I have 4 separate aquariums and use this as a water conditioner for all tanks. I also add to the tanks when a fish is stressed/sick and when I add new fish, plants and/or decorations. Love that it comes in a pump option and that it's cheaper on Chewy.com than anywhere else. Lifetime buyer!”

“nature in a bottle. used other bacteria in a bottle brands and found the Fluval cycle will start the nitrogen cycle much faster on a new tank ! love this stuff !”

“Good For Betta Tank. Product does what I need it to do It's easy and convenient My favorite brand for my Bettas”

“Got the tank squared away in a day. I had to medicate my entire tank, and killed all of my beneficial bacteria. This microbe lift product got everything back in order very quickly. My tank cleared within 24 hours, and I can see the biofilm starting to build back up already. Great product, highly recommend.”

“Best Value for Size. This is the best price for the size that I can find. Great to have a slightly bigger size bottle or water conditioner when you have a large fish tank and you go through this stuff all the time. Shipped quickly and got to my house safely without any damage to the bottle.”

“Good Price. Good price for good product. I would buy it again.”

“Best for shrimp. I use this for all my shrimp tanks and love it. They seem to do a lot better with water changes when I add this.”

“Helps cycle your tank. this is my first betta tank, and I was told up until I got my fish that cycling the aquarium was optional. So, to aid my cycle, I bought a bottle of this and Stress Coat. I've been using those instead of regular water conditioner and patience, and my water parameters are perfect and consistent.”