An article submitted by forum member Chuck Greene (forest109) details the customization and installation of a 3D background. The article takes an in-depth look at the selection process of a background including some of the issues and decisions you will have to make. As stated in the article, 3D backgrounds are popular in Europe but haven't caught on in the U.S., limiting their availability and size options. Once you've selected your background, Chuck covers topics such as painting and making modifications for filtration and water movement.
If incorporating a 3D background into your next aquarium is something you would consider, make sure to read Chuck's Customizing and Installing article.