One of only two tropical marine tanks at the Aquarium. I think the one in the photo above probably used to be two separate tanks but now they are connected through the centre.
The two most obvious fish visible in the photo are a White-spotted Puffer Arothron hispidus at the top and a Pacific Double-saddled Butterflyfish Chaetodon ulietensis lower down. The signage was completely outdated, but I counted seven other species in the tank.