Phosphate reduction/ removal is most likely the answer. Get a refugium with Macro algae and CHANGE your media in phosphate reactor more often. Your media might be getting saturated in 2 weeks depending upon how much is bound up in your rocks, tank, algae, etc. Use less media, change every 2 weeks. Use a great test kit like DD merk, Hack, or colormeter or send to AWT.
You must export the same or more nutrients than you put in. Overfeeding, tap water, high phosphate foods, etc. Use a phosphate reactor with some phosar or ROWA or whatever, and something to lower nitrates like a fuge, AZNO3, or whatever.
check out:
http://reefkeeping.com/issues/2006-09/rhf/index.php">http://reefkeeping.com/issues/2006-09/rhf/index.php</a>
[IMG]http://www.advancedaquarist.com/iss...st2003/chem.htm">http://www.advancedaquarist.com/iss...st2003/chem.htm</a>
[IMG]http://www.reefkeeping.com/issues/2004-05/rhf/index.php">http://www.reefkeeping.com/issues/2004-05/rhf/index.php</a>