Yes, that is my opinion (aside from using raw tap water).
I discuss the carbon/phosphate thing here:
http://www.reefcentral.com/forums/showthread.php?s=&postid=12753198#post12753198
I discuss the carbon/phosphate thing here:
http://www.reefcentral.com/forums/showthread.php?s=&postid=12753198#post12753198