I'm not sure I agree with no shutter speeds below 60. . .probably a good rule of thumb for fish, but not necessarily for corals. For my corals, I usually don't go above 30. I recently did a couple actinic lighting only shots at 1-2 second shutter speeds, and they turned out great. Just use a tripod and either a remote shutter switch or put the camera in timer mode so you don't get any shake when you take the picture. In general, I use narrow aperture/slow shutter speed on corals and wide aperture/faster shutter speeds for fish. It really takes some playing around, though, because it depends on your tank, the fish, the orientation and type of corals, etc.
One little hint I can give you is if you use Firefox for your web browser, there's a plug-in you can get to allow you to read the exif data from the pictures people post. It doesn't work for all pictures, but whenever I see one I like, I pull up that info to see what settings they used. I can't remember the name of the plug-in, but it shouldn't be too hard to find on the Mozilla homepage.