P.S. Make sure you read up on it before you use it, there is a lot of controversy around this product. If you use it as recommended (dosing the tank) you can cause a crash. Many people soak nori or frozen in prazi pro, although this is not recommended by the manufacturer. The best way is to dose a QT tank, but personally I don't remove fish from my display. If you search the reef central archives I'm sure you will find threads about prazi pro.