Step 1: Drill holes in the bottom so water is pulled down through the filter media.
Step 2: Clue a piece of plastic to the cut out section on the side where the water was pulled through. I recommend using an epoxy designed to bond with plastic. Also be sure and let it cure all the way before you add water.
Step 3: Clue some wire mesh on the inside of the filter intake so shrimp are not able to crawl through the slits. Don't forget to cover the small hole halfway down the filter chamber.
Step 4: Layer your filter media. I had to buy two larger blocks of foam and then cut them to fit.