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I've read many places that DSB's do not work as they would in a larger system in nano systems. I started with one in my 29, but took it out after researching a lot. It's really up to you and whether you want to lose that much real estate in the 7 gallon tank. DSB's require 4+ inches to work efficiently. If you skimp and go 1" you're not going to get as much anaerobic activity as needed. The surface area in a nano is not substantial enough. The size of the grain also plays a large part. Oolithic is the way to go IMO if you really want to go DSB. I personally like faux or BB. I wouldnt rely on a DSB to do diddly for you in a 7G nano. You're better off vaccuming and frequent regular water changes.
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