I finished our new pond a few months ago. Its about 5x5x2.5. I built my own filter using skippy type construction, but i also have a second filter in line to the waterfall that I am using as a bio filter. I also built my own skimmer that is working great. The skimmer cost about 4 dollars to make. I have a 210gph pump in the skimmer and a 520gph pump in my filter box. The filter is gravity fed from a bottom drain. I built a bypass valve between the filter and the waterfall so i can shut the water off to the waterfall and use the pump to pump out the filter box for water changes. The pond turned out great and our fish are doing awesome. Without all the great information on this forum our build would never have gone so well. We are planning a bigger build for next year.
http://s1134.photobucket.com/albums/m603/koicometshappy/? action=view¤t=IMG_20110717_194657.jpg
http://s1134.photobucket.com/albums/m603/koicometshappy/? action=view¤t=IMG_20110717_194657.jpg