Also the product might be able to cycle your tank in 48 hours, but that does not mean you can go out and buy $500.00 worth of stuff and just toss it in. Every time you add anything at all your tank will go through another smaller cycle. Also the live bacteria in your tank will determine your cycle time and determine how much livestock you can have in your tank. You need to have surface area for that bacteria to grow on. For example you need live rock, sand, and/or boilogical filtration. Don't waste your money on stuff like that put your money into higher quality live rock. The better the rock the better off you'll be forever not just 48 hours.