I am going to take the opposite tack and say that a refugium the size of an AC 500 is indeed a waste of time and money. Somewhere in part 1, or two in the series to which I will post a link is some information backing up my claim. 
http://reefkeeping.com/issues/2004-01/eb/index.htm
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Bob
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To be loved you have to be nice to people every day - To be hated you don't have to do squat.
---------Homer Simpson--------
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