I would tend to agree that a refugium below the tank is not as good as a refugium above the tank because of the trip through the pumps to get to the main tank. With that said, it's not always practical to have something above tank so in those cases we just ake do with whatever we can make work. I see nothing wrong with going with two, though....
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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