I'd say based on the color similarities around the eyes and mouth that it's probably the same species as the one pictured. I couldn't find a species name on that page however. fishbase.org may be helpful.
This probably is a toadfish, as Matt suggested. It is likely to be the Gulf Toadfish (Opsanus beta), a highly-variable species from the Gulf of Mexico, South Florida and Northern Caribbean.
Amai, we could confirm this if you could get a good sharp photo of the fish outside of his lair, and especially with the dorsal fin erected. This fish eventually grows to almost a foot and will be a voracious predatory eating machine.
There is a very slim chance that it is a Labrisomid blenny, but a body photo showing the dorsal fin will allow us to rule this out.