Well here is an update on my sump. I finally got it running. Since my first idea wasn't going to work, I drilled three more holes and kept the output of the skimmer to drain in the same compartment which the skimmer is in. I am very happy the way it came out. I want to thank all of you for your inputs. If you still think that I have to change something, please let me know. Oh, the section on the left will be the refugium. I haven't plumbed it yet. But will soon. I will post another pic when its all really complete.