Quote Originally Posted by rmalone View Post
Crunch your numbers on volume, but otherwise there is no reason it wont work. Make sure you keep the drain on the middle tank high so it wont drain all of it's volume into the bottom sump tank. But yeah you can make that work, there is 1728cubic inches per gallon as a little guide. It will come down to how many gallons the display drains and how many gallons your going to make the two sump tanks hold without overflowing.
Good to know thanks. The sump will just be an old aquarium, nothing fancy. I was thinking of just getting a taller sump just in case, that way it has less of a chance to overflow if I lost power.