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I usually use ISO 400 and shoot in manual. The f/22 aperture is OK for these types of shots. Set your aperture at f/22 and push your shutter button half way down to get a meter reading. Then adjust your shutter speed so the meter needle is at +1. Take a picture at that setting, i.e., one stop overexposed. Then adjust the shutter to a meter reading of zero and take that photo. Then -1 for a third photo. That will give you a bracket of three images. Choose the one that is the best exposure of the three.
Make sure exposure compensation is at zero and spot or center-weighted metering. This will make sure your meter is reading the exposure for the corals, not something in the background.
Gary