The overflow box has a few chambers in it, one in the tank, the skimmer, then a "u" tube carries the water over into the box hanging on the tank. That hits a small chamber of its own, keeping the siphon full. Here's where it gets cool, the water "overflows" over a small wall in the o box. (overflow box will hence forth be the "o" box) This water then Falls down into the sump, not a siphon anymore. Then water goes into the first chamber, gets heated, skimmed, whatever, the three walls you see are a bubble trap, the water goes over, then under, then over again, thats a three baffle system, people do all kinds of things, but I had limited space. The next chamber is my fuge, which you should do, you put cheato and rock in there, some put sand, but I didn't. Then the next wall is the where the pump goes. Now this is how it works: the pump PUSHES the water up into your tank, causing the water to overflow into the skimmer on the o box, and keeps the cycle going. We can hook you up with what to do when you are ready. Price out a tank that will fit under your stand or where ever you want to put this, then maybe you can have a glass guy install the baffles, they are in like every town, people break windows so you need a glass guy. I had mine built real cheap. He even cut my o box so it would fit better, it had a 2" space to hang from, but I tightened it dawn to fit better at 1" I have it all documented on this site under equipment. Project 5K helped me out tremendously, so thanks again P5K!!!
Sump installed:
Overflow box, custom cut to fit on the frame of tank better.
Close up of the fit:
