This is a Fluval Cycle. This reduces the cycle time of the tank. I am using it now with a betta tank that I had to replace in a hurry and it (the fish) will be fine. I use this on my water change and at that point I don't even need to measure, I just know how much to add. This will definitely help the tank cycle. There is a lot of junk in this area of the shops. I'm always trying new things I learn. There's other good stuff in there too. I didn't like Tetra, Marineland, API Quick Start, Aqeon Balls, Biological Boosters. Don't waste money on them. Seachem and Fluval are good brands and the API does some decent stuff, mostly test suites! Sponge filters are good too.
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