I am still in the research stages of Marine Aquariums, so me actually purchasing much of anything (besides books, which are in the mail ;D) is a few months out. My current plan, which is a pretty slow approach, is to pick up an all-in-one unit (leaning toward Biocube 29 HQI... unless there's something better out there in the same price range!), and then use baserock (25 lbs). I plan on seeding this with some live rock. After allowing this to cycle for a good while, I hope to add a clean up crew, then wait even a while longer before finally adding fish (at this point, the fish are something I havent even thought about. I want everything else set up first). Eventually I would like to add some coral, but that's still a LONG way down the road. However, I do have a few questions. Am I correct that during cycling I should leave the lights off, and avoid water changes, but use all the other equipement (filters, heaters, skimmer)? Also, how much live rock should I seed with? I've heard some pretty nasty stories about unwanted hitch hikers, so I am hoping that by using more baserock I will limit the probability of picking up the bad ones My last topic (atleast for this post! ) is about sand. I've heard crushed coral isn't a good option, and I already was leaning in the direction of sand (thinking black at this point). However, do I need live sand? or since I am not in a hurry, would the live rock be enough to seed the whole tank? Also, how much sand should I be looking at for this size tank? Thanks so much!