Thoughtful underwater and aquarium photography begins with patience, careful light, and respect for the animals on the other side of the lens.
Water and aquarium glass change the way light behaves, so strong photographs often come from working with the available light instead of fighting it.
Move slowly, hold the camera close and square to the glass, and wait for the animal to enter a clean composition. Avoid flash when it could disturb animals or create reflections.
The best image is never worth stressing wildlife. Patient observation produces more natural behaviour—and photographs that tell a more honest story.