I wish I knew WHY I've never had problems with Valonia...my tanks have always had some but it has never multiplied to any problem level.
If you don't already have one, try adding a refugium. Grow some good algae there (maybe even valonia). That may use up nutrients and the valonia won't be able to get out of control in the main tank. You'll likely still have to weed it manually out of the display until you get growth in the 'fuge, though.
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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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