Well, at least I think it is a Signalfin Goby (Coryphopterus signipinnis) – it is hard to tell with such a tiny and cryptic fish. They only get to about 1.25 inches long, but what is funny is I distinctly remember taking this photo and I spotted this tiny little fish from a decent distance away and under a large tabular coral and made my way in for a nice photo… I don’t think anyone else in the group even had a clue what I was looking at and by the time I finished taking my photos, they were already ahead an bit and I had to go catch up.