This photo only shows one section of the large, jam-packed tank that is the main showcase of fish in the Tropical Pacific Gallery.
An excerpt from my 2011 review:
Tropical Pacific Gallery – this is the best part of the aquarium, with huge floor-to-ceiling tanks around every corner. A spectacular set of exhibits and a long loop surrounds the aquarium’s largest exhibit: Tropical Reef. In the 350,000 gallon tank there are over 1,000 animals, and the water is brimming with a dizzying array of color. Large inhabitants include olive ridley sea turtles, Queensland groupers, bonnethead sharks, Napoleon wrasses and cownose rays, but there are so many smaller fish that it boggles the imagination.