I took a shot at editing your pic Jessica. I'm not all that good at post-processing but I did what I usually do. I used Photoshop CS2 becouse thats all I have.
First I used the curevs tool (Image -> Adjustments -> Curves)
I used the white eyedropper tool first (to the right in the red circle in the link below), and then pressed the sand. It works with anything white, then I took the black one and pressed a dark bit of the background. This in basicly the same thing that Auto levels does but manually. Then I made the curve into an S-shape, again see the link below.
http://www.marcuspajp.com/Picture%202.png
Then I used Smart Sharpen. This does the same thing as Unsharp Mask but is supposed to be slightly better, it is a new feature in CS2. I Used Amount 80% and Radius 1.3.
There is really no wrong or right here, Its all about what you like and what you think the coral really looks like.