Only thing I don't like about backgrounds, or having plexi in the background, is if you get any water spillage between the 2, you will get water marks between them. Then that takes removing, cleaning, and putting back on. And with my fish, I do get some splatter over the edges. My 55G has a background on it, and it looks horrid. I just don't want to empty the tank to move it enough to paint the back. Also, when I get my 300G, I plan on using the 55G as a sump anyways. Will need to find another cool paint to use when I get my 300G, lol.