Thanks for the input guys. I've heard mixed reviews. Some people say it works great and like you and I've seen a few other people say it doesn't. I was just curious if it fit into the back compartment. I ordered a ghost skimmer off a guy on nano reef and when I recieved it, it was completely broke but he gave me my money back. I was debating whether to go with a ghost skimmer or a hydor. I want something quiet because the tank is in front of my bed and I'm a light sleeper. A guy locally to me is selling a ghost skimmer and I was debating between ghost or hydor.