I want to run a deep sand bed. Currently I have about 90 - 100lbs. of live sand in my 55, however I am having major algal problems, but I think its because I didnt have a good sand crew. I just got my 50 nassarius snails yesterday, plus 5 from before and 1 sand shifting sea star. In the 90 I am going to get 1 or 2 more sand stars and atleast another 50 nassarius snails. From what I have read about all the DSB articles, I know that if you have enough critters turning it over, it should actually contribute to the overall success of the tank. If anyone has experienced differently let me know, I still have about a 2 weeks before I start this tank up.