Lately I've been getting the itch to start a saltwater tank. I have several years of experience with freshwater and have been involved in saltwater maintenance and care with my company for about a year. I am cramped for space, but have plenty of experience with nano tanks under 10 gallons. I was wondering what kind of setup I could do in, say, a 5 gallon cube? I understand this is probably too small for most fish so I would like to limit it to reef-safe inverts and easy corals such as mushrooms. Any advice on what I would need would be greatly appreciated!