There is certainly a place for flash photography and in a reef aquarium, do to the "unusual" lighting, you can aquire a faster shutter speed at lower ISOs resulting in very sharp images. However it does not do well at capturing the "pop" of colors that you get from the color temperature of your reef lighting. It washes out the flourescing of corols and some fishes. Its fun to photograph some very vibrant corals with and without flash and see the difference. they are beautiful in different ways.