Review: "The reviews are not lying, this stuff is magic! My tank was absolutely disgusting, they say to let it sit overnight and you may need to do it again, but after only one hour, my tank looks almost brand new! There isn't a strong chemical smell so I'm shocked by how well this worked and fast! It was sup e easy to use and worked faster than they even advertised. Highly recommend for an effortless clean!" - TECHnicallySmart