Scorpionfish
It is not too easy to see scorpionfish since they are so good at camouflaging - as can be seen (or not) in these two photos.
On the second last dive of this trip, near the beach just north of the Windsock dive site, we came upon two scorpionfish on the white sandy bottom at a depth of about 35 feet. One of the scorpionfish, the smaller one, was aggravating the other until finally the larger one turned on the smaller one and eventually wrapped its mouth around the head of the smaller one. Linda captured all this in this great video clip. If you have the bandwidth, view this in full screen at the highest resolution. It is awesome. Below are my photos of the encounter.