I did sw for many years and starting with such a small system has a lot of pitfalls. I started a 2.5 gal system when I found a hitchhiker mantis shrimp in my coral propagation system. I didn't want to throw him in the sump so I bought the 2.5. I used a Tom aquatic mini canister filter, and the motor from a very small HOB filter as a power head for more movement. A few pieces of rock, some zoa's, Paly's and mushrooms. 25% water chanes every two weeks. It was easy to maintain because I had three other large very well established systems running. If I was going to do it with a tank like yours there is a company that makes HOB filters with a built in 3 watt UV sterilizer. I would also get a pico protine skimmer, several companies make them. In the HOB I would not run ceramic, just filter floss and carbon. The live rock in the tank is taking care of the biological filtration and the skimmer will remove the larger detritus. I didn't have any evap issues. I used a 13 watt coralife CF hood that acted as a lid and fit perfectly.