sunset pizza, thanks for the post! I'm also in the process of converting over. I'm not an expert or anything...I'll just pass on what I've learned about all this in the past month or so. Right now, I'm attempting to make my SD sand "live" before putting it in the tank so that I don't end up having more of a cycling event than I have to have. I put about an inch-deep layer of sand in a large Rubbermaid container with a piece of live rock, an air stone, and a heater. My 9 for $99.95 critters package (ipsf.com) arrives Thursday. I'll keep the sand brewing with the critters in the Rubbermaid for probably 2 to 3 weeks before switching my tank from CC to DSB. When the time comes to lay the sand in the tank, I'm gonna put 4-5 inches down, then the last inch or so will be the sand in the Rubbermaid. Hopefully, this will minimize the cycling. BTW, I hated paying $99.95 for the package but after researching it, it seemed like the most effective way to add biodiversity and avoid major cycling in the tank. Anybody else considering doing this should go to ReefCentral and do a search for threads related to this topic. Dr Ron Shimek is there with lots of good info on DSB's and such. Finally, one link there has an article on how to do it and it recommends placing your old CC into bags fashioned from pantyhose. Then, place the bags in amongst the new sand to help cycle the sand.