12-05-2007, 01:35 PM
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Hmm, I don't have any experience with the Emperor filters, but I use an AquaClear 50 for my 40 gallon tank.
The AC units are very easy to maintain, and are notorious for their ability to last years and years. I have owned 3 different AC units and they all served me well - I still own them, I just needed to upgrade sizes. Fine items, no doubt.
Pick up the 30 gallon tank if you can, you'll be upgrading from the 20 gallon eventually, might as well do it from the start lol.