Not a particularly great photo of what may be Golden Goby (Priolepis aureoviridis) in a crevice at Sail Rock.
I didn't actually see this tiny Goby, which must have measured no more than 1cm, when i took the photo as i was actually taking a picture of the Cowrie shell (just visible on the left).

This occasion was the only time i've encountered this species, but hopefully i'll find another one and try to get a better photo of it.