+1 on the soda bottle. I bought a little plastic base from MD that has a check valve for air line tubing to bubble air in there and then I just run a $5 home depot clamp on lamp over it.
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May 2013 RC TOTM
http://reefkeeping.com/joomla/index.php/current-issue/article/133-tank-of-the-month
Currently on hiatus...
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