I'd keep it simple for now. Get used to cleaning that tank out, and maybe move on to something else later. Or you could always change out that tank to something more elaborate once you get more comfortable. Surprisingly you do a lot with a 20 gallon.

I have three tanks with false-bottoms. They aren't hard to clean out. The smallest one I actually take out the egg crate and remove all of the water to clean out once a month. I do periodic water changes inbetween that time. My largest is a bit more troublesome since it's 29 gallons and loaded with rock. Someday I'm going to change that out soon.