Was looking to add an HOB reactor to my Nano, but having a tough time finding a spot to place a pump. The 2 outer chambers have the return pumps at the bottom of the tank, so the plumbing takes up the room. The middle chamber has the media box. I was able to get one extra pump in there for my chiller by tucking it under the media box, but running the tubing through the outer portion. I bought the setup used so I wasnt sure if this was the stock setup...any feedback would be appreciated!