Maybe you've considered this...Keep siphoning it away from the corals, rock etc...but leave it alone where you can stand to leave it (on the sand?).
I'm thinking that whatever nutrient it's living on..maybe it will use it up if allowed to grow.
If large water changes haven't helped...do the opposite. Back off on your water changes....see if it gets worse or better.
In my previous life, I knocked it out with a new skimmer. On my new tank, it just went away in exchange for hair algae...which is the lesser of two evils.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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