Mike,
Great pictures! I've been eyeing Cha Cha on Bunaken for some time, so seeing your pictures is a real treat! Was the food any good? How was the reef right in front of the resort - where they have the floating snorkeling platform?
Regarding your color hues: they're easy to fix (even in jpeg). If you have a Mac, you can edit the pictures in iPhoto (comes with a Mac) or Adobe Photoshop. If you have a PC, Adobe Photoshop is the classic tool - although there are many programs that allow you to take and add colors. Ideally, you want a program with a color wheel and one that gives you the option to reset your white balance. I know, this probably sounds like a foreign language, but it is actually easy. Just email me your questions when you (or if) you get the program.
Another thing you can do is get a red filter to put on the outside lens of your camera. It will make your pictures (as viewed through the camera's screen) appear red, BUT, when you actually see the pictures on the computer, they'll be great and color balanced (without having to use software post-picture to auto correct).
Can you elaborate a bit on the coral spawning conference? It sounds interesting. Was this a business trip (government or non-profit) or just a hobby trip?
Cheers,
Scott