I had a plenum for about 5 years. It was OK but I wouldn't go that way again. While it did "work as advertised," so too does your garden variety DSB... And like Simon points out, if you have a burrowing fish, be prepared for headaches (I had a jawfish for a while, and nothing but problems when it came to the effectiveness of the plenum when that fish was around)...
It seems to me plenums were an innovation of the early 90's .... DSB's were an innovation of the later 90's .... same benefits but less problems overall.
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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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