I think this is an angelfish trying to avoid a curious diver. One of the rules of visiting the undersea world is "leave only bubbles and take nothing but photos and memories." Unfortunately, many scuba books show someone touching a fish or stroking coral reef (or sea fans).
You can also switch to the brackish water of the Intracoastal Waterway. At West Lake Park in Dania Beach, just south of Fort Lauderdale, canoes can be rented for the afternoon. And enjoy the eco-system of mangroves (plants that seem to "walk" like a man). Lobsters and little fish live between the roots of the mangroves to avoid predators and then run to the reef in the ocean. This park is located west of John Lloyd Park, the best beach in Broward County, and worth the $3.25 entry fee (per car).