There was a big article in Aquarium Fish Magazine that DSBs can be disasters waiting to happen, and that they really haven't proven to be any better than just a couple inches of sand.
No 2.5 inches is not a dsb. I think that would be perfect for your fuge.
Some people swear by dsb's though, so it's up to you what you want to do. After reading that article though, I don't think I'll ever do a dsb again.
I was looking for it, but I don't think it's online yet. I read it in the magazine. It might not show up on the website until next month. Here is the website though if you want to watch for it. http://www.aquariumfish.com/aquariumfish/home.aspx
That article is in the March issue. They send out the magazine way ahead of time. It's called "Delving into Deep Sand Beds". The one they have online is still February.
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