This image was taken while I was snorkeling on holiday in Raja Ampat, Indonesia. I saw this amazingly coloured anemone and to my delight two clownfish were hosting the anemone as well. I tried including some sun rays by diving down and taking a photo from below the anemone. I only used natural light to take the photo, since it wasn't very deep I didn't have to use any strobe lights.
The photo was taken on the SeaLife DC2000 with a wide angle dome lens. The settings are, ISO 125, f2.8 and a 1/500th of a second.