Small tanks are one thing, but I can't imagine keeping a marine tank in a Biorb. IMO
there is nothing about the design of a Biorb that lends itself to a successful marine tank (woefully inadequate lighting, cheap undergravel filter, and I'd imagine gas exchange would be a huge issue as well).
If you're looking for a sleek, all-in-one look, maybe you would enjoy a kit like a Biocube, Nanocube, or Aquapod. These tanks are easy to set up and maintain, and they are made for low-tech reef applications. The models with the PC
lighting are adequate without modification for many soft corals and some LPS