Take a look at my pics in my profile, I have a couple of pics of my fug I made myself. You need to decide what all you want in it and how much room you need. Then you can decide what size of a tank is needed for the fug. I have a chamber for the inlet where I have filter floss a chamber for the macro algae and a chamber for my pumps, protein skimmer and return pump. The best thing to do is research it on the net and look at other peoples ideas. You can get your local hardware store to cut glass for dividers and use aquarium silicone to put them in place.