As the others have indicated there are many designs. http://www.wetwebmedia.com/refugdes9.htm - shows one of the simplest said:Thanks! Thats what i was looking for! Just different designs.
Another thing does the size of your set up need to vary on the size of your tank?
Another thing does the size of your set up need to vary on the size of your tank? said:The size of the sump needs to be big enough to handle all the back flow water from your system during a power outage, so indirectly, yes, the sump needs to be proportional to the size of your system.
As far as your refuguim, it too really needs to be in proportion to the size of your display... IMHO, a refuguim should be at least 20% the volume of your display system for greatest effectiveness...