Well fastrd400 got me thinking and I went home a couple nights ago and stared at the 56 gallon. Well I'm gonna tear it down for freshwater and start the move to saltwater! I figured by the time I can get it all set up that my 10 will be pretty established. So it won't hurt too much moving it all over. I was just wondering what is needed for a tank this size? I have read that a sump or refugium is not necessarily needed but recommended? I will be getting a protein skimmer and What is the purpose of an overflow? I have been reading on them all for a few months, but still kinda confused on it..any help will be great. Hopefully gonna be able to start the tear down of the freshwater in a couple days..and will be starting a new build thread..any help would be great! I want to take the time to do this the right way..