Aragonite is the best choice for both its buffering capabilities as well as its time releasing of trace elements into your pelagic area of your tank(water column) IMO!
I am not a firm believer in(common) sand> coral sand, I believe, is the same as crushed coral though...sand? are you talking about common sand like you would buy at the local Home Depot? That is no good IMO. _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |