Pest and treatment/ prevention
Red Bugs
http://www.reefs.org/forums/topic43945.html
http://www.dfwmas.org/Forums/viewtopic.php?t=14402
http://www.melevsreef.com/redbugs.html
http://www.advancedaquarist.com/2010/3/corals
And Before you ask yes there are a lot of red bug links, because I had to deal w/ them....
Flatworms, Snails & Limpets
http://www.liveaquaria.com/general/general.cfm?general_pagesid=362
http://www.liveaquaria.com/pic/article.cfm?aid=122
And more....
http://www.chucksaddiction.com/coraldisease.html