After about 20 years of fresh water aquariums I've decided to try my hand at a reef tank. I'm starting out with a Reef Casa Studio 18. I'm also using an AI Prime 16HD, Duetto 2 Dual ATO and a Tunze Comline 9001 (not running yet, but in the back chamber). I'm also using a mixture of Stax Flat Rock and Marco Rock, with CaribSea Ocean Direct Sand. Here's are some pics of various stages of cycling. I think I put too much rock and may end up taking some out down the road.