smashing crushed coral into sand smashing crushed coral into sand. Swapping Crushed Coral for Sand REEF2REEF Saltwater and . Sep 14 2014 It has been previously advised by several members to switch out my Crushed Coral for Sand so I m taking the plunge. I ordered 20 pounds of pink sand from brs for my 30 gallon talk.smashing crushed coral into sand smashing crushed coral into sand. Crushed coral in sump The Reef Tank. Aug 06 2010 I know have sand in the display tank. But was wondering if it would be a good idea to use the crushed coral in the sump I ve heard mixed things on what to use. A friend only uses a few pieces of Live rock and then macro algae.