My current tank is a 12 G JBJ Nano Cube (although I bought mine like 12 years ago, so its a little different than the current set up). Its an all-in-one tank, so it comes with lights, a powerhead, and some extra things for filtration. I replaced the compact florescent lights with some LEDs, and I also got a slightly more powerful powerhead, but the stock stuff is fine to start out with, especially if you only want to keep fish. I haven't had any problems with the tank and for me it was a perfect introduction to reef tanks.