well... here is a link to the one i plan to build for my 150g... http://i18.photobucket.com/albums/b1...raspects/7.jpg
and here is the overflow... http://i18.photobucket.com/albums/b1...s/overflow.gif
the pump will depend on the size of the tank and the amount of water that the overflow will handle. If you dont match it accordingly, you'll either pump too much water back up, emptying the sump, or you'll pump too little water back up, which wouldnt be horrible, but wouldnt be ideal. Most people with fw
wet/dry setups will use pot scrubbers instead of bioballs just because they are alot cheaper and work just as well, if not better.
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