Next, the filter.
I'm a big fan of sumps but not of drilling big, glass tanks...or pumping water up 8 feet (head loss). "Dump" filters are basically a reverse sump and sit on top of the tank with the pump in the tank.
Here's how I put together the one I'm using for this tank.
First, get a rubbermaid. I like the under-the-bed kind (and clear ones) since it's easy to see what's going on and it allows you to open the top drawer of the 3-drawer thing (more on that in a bit).
Drill three holes. One for input (attach a hose adapter) and two for dumping back into the tank. I always do atleast two in case one gets plugged somehow.
I modified this three drawer paper holder thing by cutting a hole in the top (water in) and holes in the bottom of the top two drawers (to allow water to sprinkle down). The bottom drawer is designed to allow water to return to the rubbermaid.
I filled the top drawer with filter pads and the bottom two with bio stuff (bioballs, army men, plastic pot scrubbers, etc.). I added some bio stuff from a couple of my active dump filters (already in use) and a poopy piece of fluff in the top drawer from a box filter.
To get the water from the pump to the 3 drawer thing, I used standard PVC fittings (not glued).
I support this on the top of the tank with some small wood....and voila... dump filter in action.
I've used these filters for years (have one on my 125g) and think they're great. You can use a relatively small pump or powerhead since you're not losing much to head (flow loss of pumping against gravity). I use them as half of the hoods on my 2'x2'x1' tanks.
Matt