I know in my system increasing flow and running phosban have made a huge difference. Old lights also cause noxious cyano blooms. Other than that it's the good old siphon hose, and almost ALL of us have to do it, but by the number of times you have posted tells me you know all this by now... 
I hear bleach clears it right up though.... 
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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