NewsDeep Sand Bed (DSB) Diagram Yet another diagram, illustrating a deep sand bed. Most likely this would be separate from the aquarium, perhaps in line either after the overflow or after water gets processed in the sump.Read Ryan GrippRyan Gripp founded Reef Builders in 2006. He writes about technology, industry and other associated news relating to saltwater fish tanks. He went to Depaul University and has been keeping reef tanks for over 15 years. Previous ArticleDiagram of Fish Only with Live Rock Aquarium Next ArticleBarrier Reef `can adapt to warming'