Well, they are not ALL SPS. About 40 or 50 are SPS - and all frags at the moment - and the rest are Zoas, LPS, Rics, Favia, Acans, etc. However, I am not placing my SPS frags right next to each other. It will fill in nicely and I will simply sell of the frags as I need to trim them. Also, it's a peninsula, so I am placing corals on both sides of the rocks, which gives them more places to grow.
It's laid out fairly nice ATM. Here's a vid to give you an idea :
http://www.youtube.com/watch?v=I89KENiWMEw
http://www.youtube.com/watch?v=Iq7CS...eature=related