Says to use for 7 days and then you are good to go. This is false. Once you start using this product you can never stop. Stability does as it says and keeps your tank levels optimal, but only as long as you continue to use it. Seachem utilizes bacteria similar to those produced naturally by the fish, but not the same bacteria. This information was taken straight from Seachem's website. The Stability bacteria use all of the oxygen in the water and are introduced in such great quantities that the natural fish-born bacteria never have a chance. Once you stop using this and the bacteria left in your tank die out, it is as if your tank were brand new and you will have to cycle all over again (the natural way). Use Tetra Safe Start. This product utilizes the same bacteria that are produced naturally by the fish, and is ideal for long term tank stability.