11-29-2006, 11:43 PM
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Depends on how many things you have covering the ground (rocks, plants, wood, decorations) to say if an undergravel filter is adequate. With lots of stuff in the tank, the filter will easily get clogged and have problems. More information on your tank, and/or a picture would help.
I would add another HOB filter whether or not you get rid of the UGF, cause as previously stated, UGFs just aren't up to par with mechanical filtration, but do wonders with Biological filtration. If you plan on getting rid of the UGF, and add another HOB, keep the gravel filter running with the new filter for a month or so, so it has time to grow some batceria colonies.