i dont clean the coraline off the sides or the back, a lot of people do just depends on what you want it to look like.
you can paint the back of the tank, better than one of those tape on backgrounds, w/ a marine tank the saltcreep will get inbetween the glass and the background and wont look very good, just depends on what you want.
something to think about anyways, lol
goto go, have a good 1
Jay