Hello everyone! I've currently had my 20G long tank for about 10 months and things have been great! I've really gotten everything under control and managing my tank isn't a hassle at all. I definitely want to upgrade my tank to at least a 55 gallon but don't want to get too out of control with it because I'll be moving within two years. At that point, I'm setting up my dream tank. \n\nA few questions for you:\n\nIs there a big difference between the necessary items I'll need for a 55 versus a 75 or a 90 gallon? I'd like to reuse as many pieces as possible for an upgrade, but just wasn't sure. \n\nIs a refugium absolutely necessary? I'd definitely like to have a protein skimmer and over filtrate. With frequent water changes at least every other week at the absolute worst, is that fine? \n\nWhat are some of the best fish for a 55 gallon? Is there a big difference between the fish I could use in a 55 versus a 75 gallon?\n\nI'm only interested in fish only with live rock at the moment. I'll tackle corals later on. Any help would be great! Thanks!