On the night dive I had one kick ass flashlight that my dive master made me buy. It was too bright for photography. I actually had to hold the light to the side. Autofocus took over and everything was flashed. You hold the light in one hand and the camera in the other. It’s good that all you use are your legs and fins to get around. Well, I saw three types of urchins. The classic very spiny and not so colorful brown ones are not my favorite. By the way you’re looking at the ass end. Of course, the mouth is down and eating the algae. And the other thicker spined one is none to photogenic either. It was the blue and orange ones, that I believe are urchins, which are the most interesting and colorful. I had posted back in August that I thought this might be a starfish. I’m still not sure. They come out at night. With all the spines, I don’t see what anyone would want to mess with at anytime, even daytime. But during the day you’ll be lucky if you chance upon an urchin.
But boy, do they come at night. So I can’t find a similar picture on the ‘net. And my choices are starfish or urchin?? Now more information suggests maybe – nudibranch – a type of slug. But honest I found a picture vaguely like this on the ‘net. Someone will correct me, I hope.