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It's got a 10x6 footprint which should sit fine in a 20 (11 3/4 wide I think). It's the 19" height that was a pain for me. I think the new model has a different 'cup removal' design. I'm not sure if that mean it now slides off instead of lifts off.
definately pass on it and go with a needle wheel reef octopus. This is the 3rd skimmer I've had, and I'd say about 3 times better than the 2nd best I've had. It's really amazing how much skimate I get,and extremely dark skimate at that, basically sludge. Crystal clear water is important