Just up and paint the back of the tank.
I really like how black looks painted on, but I've seen other colors/combinations that look good.
You can get a little jar of latex and get it tinted to whatever color you like at most big-box home/garden stores, they cost just a couple dollars, and get a chip brush for another dollar. Should be plenty for most tanks.
I've also used spraypaint. need to do it outside (or in a workshop), and takes a bit more prepwork with taping off the opening, but I found it to be easier and quicker then brush-on latex.
The latex is probably easier to remove if you don't like it or something.
I really like how black looks painted on, but I've seen other colors/combinations that look good.
You can get a little jar of latex and get it tinted to whatever color you like at most big-box home/garden stores, they cost just a couple dollars, and get a chip brush for another dollar. Should be plenty for most tanks.
I've also used spraypaint. need to do it outside (or in a workshop), and takes a bit more prepwork with taping off the opening, but I found it to be easier and quicker then brush-on latex.
The latex is probably easier to remove if you don't like it or something.