Thanks Steve:
To those who ask about DSBs... Well, hermits are all right for a particular type of set-up. The problem is, they eat algae, but this doesn't remove anything from the system. Hermits don't grow or reproduce particularly rapidly, so your nutrients just get recycled back into the water as hermit poop.
Now, a thriving colony of a lot of different types and sizes of worms will eat an amazing amount of bacteria and sift your sand. Do a few web-searches for succinct articles on DSBs. The worms reproduce VERY quickly, so much of the nutrient export is in the form of protein formation for the bodies of the worms. If you are worried about a thin layer of algae, don't be. Just get a fighting conch, or if you have a LARGE tank with a square yard or so of sand get a queen conch. These are great for eating algae off of the sand. Of course, after a good length of time running a DSB with good macroalgae growth you won't have much algae on the sand bed.
Hermits are alright for display tanks, but they actually kill and eat many of the helpful sand organisms BEFORE they'll eat algae. So, if you want a thriving sand bed, which means a lower maintenance tank, either keep the DSB in a separate tank or give the hermits to someone going through an algae bloom.
As far as what I got, I got the following:
Mysis/Gammarus Starter Kit: little shrimp that will eat algae and detritus
Mini Brittle Star: Grow to a maximum size of about 3/4 of an inch and sift the sand and eat algae and detritus
Microstar: About the same size, but tend to stay on rocks and eat algae and detritus
Baby Bristle worm: Dig deep into sand layer and into nooks and crannies in rocks and eat a TON of bacteria and detritus
Flora Kit: various macroalgaes for nitrate export. Very pretty colors from dark reds to light greens
Queen Conch: As mentioned above, these guys eat a lot of algae, but grow large and will need a large tank
Microvert Kit: This is essentially a bunch of sand seeded with what Dr. Shimek would refer to as interstitial meiofauna, or in more accessible terms all the very small critters about the size of 2-3 grains of sand that live on or between the sand grains. This is the most overlooked part and probably the most important. You'll rarely see them, but they are what make live sand "live." Or, that's the theory.
The problem with trying to set-up a DSB is that these little tiny worm-like creatures are one of the most important things to get it running efficiently. You see a lot of people say that you can get a live-sand bed seeded with live rock. This is only partly true. Some of the creatures like bristleworms and some of the larger spaghetti worms will hitchhike in on live rock. Many of these smaller worms ONLY live in fine sand beds. The only way to get them in your system is by putting in one of these microvert kits. Inland Aquatics sells them. Premium Aquatics sells the sludge from their live-rock bin as another way to get different creatures in the sand. People who use DSBs and get them going extremely well will rave about how little maintenance they have to do on the tanks. You just have to pony-up up front and get that sand-bed taken care of first.
Do spend some time reading through the on-line articles and archived discussions on sand-beds.
Here's a few to get you started!
Eric Borneman and Jonathan Lowrie on Sand Beds
Dr. Shimek on Sand Beds
A LARGE list of sand-bed references
Josh
P.S. If you do go out and spend a lot of money on worms, PLEASE pull your hermits out of your refugium or main tank as they will seriously inhibit the growth of these guys and will possibly eat them before they take off in growth. I lost my queen conch in 15 hours to a @#% hermit. Expensive crab food.