The larger fish in this picture are called sweetlips (Plectorhinchus) because of their big, fleshy lips. There are over thirty species of sweetlips, which tend to live on coral reefs in small groups. 

“On an afternoon dive, I spotted a small group of sweetlips in the current among a shoal of juvenile convict blennies. It took me some time to get close to the fish without spooking them. I took several frames but this one was my favorite because of the position of the fish, particularly the one on the right who seems to be yawning.” -- Nature's Best Photographer, Jose Alejandro Alvarez