Shooting pictures of fish in an aquarium is remarkably easy. The challenge here was that I was using a new camera, the Fuji x100, which had slow autofocus and a lens that doesn’t zoom.
If you want to take a beautiful picture I recommend jellyfish exhibits. These are always really well lit, and the fish are slow, strange and beautiful.
In this situation everyone crowded the bigger aquariums and made it really hard to take pictures of the fish. I stepped back to take pictures of the whole scene of people and with their cameras and phones snapping pictures.