hey here is a link for Darren [img]images/smiles/icon_smile.gif[/img]
http://www.aquariastore.com/aquaria/...203?1,34607706
and this is from Aqualink on setting up a plenium
"Bob Goemans wrote that this area will have a pH of 7.6 or so, and that dolomite is the preferred substance. Dolomite is less calcerous than crushed coral, and therefore will not dissolve as much at this lowered pH."
Steve