Hello, just setting up my first sw tank a 72 gal bowfront, finally got it filled with water and decided before turning in for the night would check to see if the skimmer worked. The skimmer I have is a bubble magus nac5e. I will applogize now for any terminalogy on the skimmer parts that I may describe wrong, and also sorry for any sp mistakes getting late and brain is getting somewhat fuzzy. From the information that I have been able to find I know that I need to prime the pump, I added saltwater into the cylindar body of the skimmer enough to cover the pvc elbow on the piece that runs from the pump into the body of the skimmer. I closed the air line valve completly and on the other side where the water leaves the skimmer I turned the pvc adjustment so that was closed. Plugged in the skimmer and all I get is a humming sound from the pump. I can feel it running and produced a little heat. Did not leave it plugged in for too long because if I am doing something wrong I don't want to burn out the pump. Any ideas of what I may be doing wrong or what I need to do to get this going? Or is it that my pump is not working properly, hoping that this is not the case. I had gotten the skimmer from a local reefer, so it is not like I can contact the company to have it replaced under warrranty. If needed I can post some pictures of the skimmer and the way that I have it set up tomorrow. Thanks