This is a great response:
"What sand creatures should one get? Do not get sand sifters. Sand sifting stars, fish, etc. will only deplete the sand bed of the beneficial creatures it needs. A good start to a sand bed is the appropriate snails. Nassarius and cerith snails are excellent sand burrowing snails. A fighting conch is a great snail to have for a sand bed as it will keep the surface clean of diatoms. Next in line are the worms. Bristle, cirratulid, and terrebellid worms are excellent for keeping the sand bed clean and shifted. (note: not sifted) These worms usually self-sustain their populations. In the beginning, all you need is 2-3 of each of these to get going. Lastly are the pods. Isopods, copepods, and amphipods are all great for your sand bed. (your tank in general for that matter) The crawl around eating waste and algae while shifting the sand around. This little recipe of critters is by no means comprehensive. There are many other creatures (most microscopic) that will keep your sand bed healthy. I recommend a combo of all of the above critters for a healthy sand bed. "
Personally I believe diversity is the key. All the above creatures play a part...and together they can be a vital part of a established/functioning DSB.
Most of the diversity in my sand is from LR and a few sources of established LS& rubble...in time most of the worms and pods will flourish....snails and such I add a few times a year. Bottom line is the more diversity available and the more stable/mature the sand bed is the better it works.:thinking: