Bubbles in water effect

Hi, I’m doing a little animation for a mate, what is gonna happen is a mobile is going to fall into a glass of water and lots of bubbles float from it. What i’m having trouble is to do the bubble animation. I need it to be as small as possible. Is there any action scripting anyone knows of?
I’ve tired to animate each bubble but this will take so much time to get the randomness and also will add kb.

Thanks for any help!!

Ollie