This is a great article about the impact we have on the reef systems of the world. It also gives some links to ways you can limit your impact. Because we don't want the only reefs to be in our tanks!
http://www.nwf.org/nationalwildlife/article.cfm?issueID=112&articleID=1424
http://www.nwf.org/nationalwildlife/article.cfm?issueID=112&articleID=1424
