Underwater animation

hey, so I’ve been completing the underwater scene tutorial on blender guru a while ago, and this gave me an idea for a short animation in blender.

here’s my test at having an animated underwater scene:

any clue on how to make it look more convincing?

i really like the fish tank atmosphere.
to improve the animation i would try to animate/randomize the sun reflections on the ground. also try to bring in some decent light rays from the spot lamp.