I have no experience with saltwater. I have done freshwater for years. I'm wanting to set up a desktop reef tank at my office. Somewhere around the 3 gallon range. It will be left alone on the weekends. I need suggestions on what tank, what corals, invertebrates, and fish, what to do to prepare. Anything is helpful. I know nothing! Is this even a practical idea or is it too much maintenance for an office aquarium?