A black Image for a reef tank can enhance the colors of your fish. Fish with dark colors will stand out more. You may consider painting the background black, but it can be time-consuming and messy. A good alternative is to use a picture roll. These are easy to install and come in many different designs. Read on for some ideas. If you already have a background, try changing it. A new color will never go out of style, but you might want to consider a new one.