I never have set one up, and I have one that goes to my tank. It sits in the sump, however I don't know if it works. When you plug it in it comes on, but it has some tubing that isn't hooked to anything. I don't know what is suppose to connect to the pvc elbow, and you will see where I am pointing in the picture, I guess that is where the tubing connects, but the previous owner had it plugged with saran wrap and rubber bands. So if I set it into the sump what do I connect to what?