I did get a few photos at the aquarium, and they served to remind me of some of the problems at such a venue. Many people were taking pictures with the flash on. That’s going to get pictures of the white reflection off the glass, not the fish. It’s better to seek the well-lit exhibits. Getting up against the glass avoids reflections and steadies the camera, but don’t prevent the lens from adjusting to focus. Better to rest a forearm on the glass. That keeps off fingerprint smears as well. Some exhibits are dark with the sea creatures highlighted from above. These have to be underexposed by at least two stops below automatic to keep the background dark.