Final Project

Hello alice community.

I'm not sure how to go about doing this so i'll start by first describing my final project.

I want to make a fishtank scene with several fish, rocks, plants, misc. objects in it. Clicking on each of these will cause an action to happen.

That's all simple enough right?

The hard part is that I want the fish to be in constant motion. An infinite loop would be best right?

Also how would I cause bubbles to rise from the fishs' mouths as they are all moving around?

So yeah that's about it. Fish will spin, wink, change to another path when clicked on. Rocks will rise to reveal hidden objects.
I just really want to make this feel like a tank with animals rather than little robots.

Edit*
What would be the best way to mimic the look of a fishtank?