I started with a goofy looking background that looked like a reef with anemones and stuff. Now I just have a solid blue and it still looks goofy. I noticed some of you don't have a background but instead have some purple stuff growing on the back of your tank. What is that? Is it something that comes with time? If you do have a fake background taped on, what kind is it? I want my tank to look good, not like I'm trying to fake it, KWIM? Thanks!!