At night these little crabs come out and you can get lucky catching them hunting and eating bristle worms on the sand bottom. In daytime they usually hide in dark holes and cracks in the reef, waiting for nightfall. The yellow line arrow crab is easy to identify, with its triangular body and long, slender legs.
Sometimes, like here, it hides in giant sponges in shallow water. I hovered over this sponge, gently moved the macro lens into the opening, and positioned the flashes in from the sides and then the work start. Staying still in swelling water trying to focus on something this small. Not touching the surrounding reef, and not damaging the sponge. After multiple exposures I move away. Sit down on a small sand area on the bottom. Flip through the pictures in my underwater camera, open the best exposures, and magnify to look for sharpness, color and cropping. I can see if I got what I need during the dive. If not I go back and shoot more – this time I could continue the journey along the reef. Incredible times! When I started out, I had to wait for the film to be processed and I did not know how the pictures turned out until days after the dive.