Hi Jonny,
You might remember me. I'm Rudy's cuz, we went to Aquamarin together? Anyway, I've explained to you the right procedure to start a marine Aquarium the other day. Maybe this link (below) will help you.
http://wetwebmedia.com/marine/index.htm
http://www.liveaquaria.com/product/categ.cfm?pcatid=15
Anyway, you made the right thing by joining this club. ; )