Top Crown Snails from Drs., Some hermits, and use the syphon tube on your next water change to suck that crap off the rocks like a vaccum.
Phosphate reduction/ removal is most likely the answer. you have a few choices. Add a refugium with Macro algae. If you don't already have one get an inexpensive phosphate reactor for like 35 bucks and put some phosar or ROWA in there. (you'll need to CHANGE your media in phosphate reactor more often at first.) 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://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>