<a href=showthread.php?s=&postid=12777283#post12777283 target=_blank>Originally posted</a> by DMBillies
FWIW, most of what I have heard about sand-sifting critters is that they eat most of the good life that grows in the sand (the life that actually cycles the sand, keeping it loose, and does most of the sand bed work). I'm sand free for the most part, so I don't consider myself an expert on the topic, but do some research on it. In a large tank 1 or 2 sand sifting critters probably won't hurt, but in smaller tanks they can likely strip the bed of life pretty quick. At the very least, be certain you have a healthy population of sand bed fauna before you get a sand sifter.
Not everyone agrees with Shimek, but I know his recommendation is that you generally do NOT want them.