I've been so envious of your setup because it started up just ahead of mine, yet you seemed to have none of the problems I went through and be way further along...
I seem to have passed the cyano stage by siphoning it away as much as possible, and doing some sand vaccuuming. It was pretty bad for quite a while. I knew it wasn't my bulbs because they were still relatively new.
The extended siphoning was made possible by rigging up a sort of "continuous flow vaccuum" that pulled from the main tank, dropped it through a cloth filter and returned the water to the sump. That way, I could vaccuum for extended periods of time without drawing out hundreds of gallons of water.
I looked hard at replacing my skimmer with something bigger. In fact, I would have done it had it not gone away when it did.
I also began running some Phosban media right around that time. I could never accurately measure any phosphate, but I figured it wouldn't hurt.
My guess is that you'll get through it and the tank is still relatively young.
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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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