I bought it at AV was listed as a sailfin blenny i think it's a type of barnacle blenny I have 2 and In my 220 and they adapted really well to aquarium I usally lose sm fish in my 220 but had these guys few weeks and they r doing great lots fun too watch
I gotta take some video of these guys dodging my adult engineer gobys really cool but I gotta catch both engineer gobys because it's only matter of time till my sail fin blennies r lunch