Ok, had to do some redesigning after I sized out the gaskets. They would take up too much room in a 5x5x5 space so now instead of being 5" long, it will be 10" long, it will still be 5" tall and 5" wide. Now it will have one, wider overflow in the middle, at one end. I couldn't fit two gaskets that close because the acrylic would probably crack while trying to drill two holes that close to each other within a 5x5" area. It will still have a float switch for an emergency but possibly only one rather than two.

Now someone told me that I would need to have the inflow at the bottom rather than the top to create currents. He said if it is at the top, the water near the bottom will be oxygen deficient. Is that true?

What do you think of the latest redesign?

Here's the latest rendering:
Screenshot2010 02 13at53549PM - PicoFuge

Screenshot2010 02 13at53505PM - PicoFuge

Screenshot2010 02 13at53446PM - PicoFuge