What is your budget?

Cheap: (less than $500)

The best 'coral only' camera I have taken pictures with and can vouch for is the Nikon coolpix 4500. It just happened to have a REALLY GOOD macro lense (and it worked very well in auto mode). It wasnt very good as a general use camera, just awesome at really good looking huge macro shots of corals and fish. It's not in production anymore but you can find them on ebay. I have yet to get my hands on any out of the box camera beat it's macro abilities for the price. I never actually owned it, it was my friends, so any pictures I took with it were that of a newby.

http://www.brett-wilson.com/images/r...d/DSCN1502.jpg
http://www.brett-wilson.com/images/r...d/DSCN1203.jpg
http://www.brett-wilson.com/images/r...d/DSCN6955.jpg
http://www.brett-wilson.com/images/r...d/DSCN1279.jpg
http://www.brett-wilson.com/images/r...d/DSCN1255.jpg


If your budget allows I'm sure some of the newer cameras, particularly DSLR's, would take some pretty awesome pictures with a macro lense