Sweet Coralline is designed to provide major, minor and trace elements required to help grow coralline algae. Sweet Coralline also helps to raise pH and stabilitise alkalinity. A tip to enhance coralline algae growth is to turn off your return and circulating pumps, then use clean toothbrush to gently brush some of the coralline algae. Once it settles you can turn on your pumps and in time, the small fragments.