Giant Frogfish (technically Anglerfish) - 10 inches high and 12 inches long. Frogfish change color to match their surroundings (or sometimes turn a dramatically different color to look like a lump of sponge), and rely on their prey (fish that swim by) not to notice them until they inhale them.
A much larger (and more common) Tassled Scorpionfish - about 12 inches long - lies atop the reef (across the bottom of this photo, facing left). Their name is derived from the fact that they have sharp, painful spines along the top of their body.
Salt-water Catfishes, which when younger are sometimes seen in schools of hundreds of 1-3 inch fish, are in this case older and bigger, with this school only having a dozen 8-inch fish. They use their "whiskers" to stir up sand to uncover things to eat.
Cleaning Station - This 2-foot Map Pufferfish is being "cleaned" by a little 2-inch Cleaner Wrasse (lower left), which picks parasites off other fish. Note the pufferfish's beak-like mouth, which it uses to eat hard corals. The little white bubble-like things on the ceiling above him are Tunicates (aka Sea Squirts).
A Hawksbill Turtle rests, while two free-loading Remoras (aka Sharksuckers) hang on to catch little bits of food that might float free when the turtle eats coral or sponges. I wonder if the presence of such large remoras on this turtle might be the result of declining shark populations (due to Asian shark-finning fleets that are decimating sharks world-wide for shark-fin soup).
Banded Seasnake (3 ft long, but diameter of your thumb) - extremely poisonous, but NOT dangerous because they are so docile/mellow (and because their tiny mouths would have a hard time biting a human anyway).
Banded Seasnake (3 ft long, but diameter of your thumb) - identifiable as seasnakes by their tails, which are a flat, vertical paddle shape. Although extremely poisonous, but NOT dangerous because they are so docile/mellow.