Eubranchus - Super Macro

I screwed on an old diopter to my 100mm macro lens today and headed out to Tasi Tolu for a morning dive. My mission was to get a close-up photo of a Eubranchus (not sure what species) that I had found yesterday. The diopter seemed like a good idea, letting me get super close to the Eubranchus. But wouldn't you know it, today the conditions at Tasi Tolu were absolutely stunning, with crystal clear water and visibility like I've rarely experienced there. I saw a huge barracuda and four reef squid laying eggs, but I couldn't photograph any of it. Having said that, here's the photo of the Eubranchus hanging out on a stinging hydroid. It's about 1cm and almost full-frame.