I have attached my animation for viewing, because I think there is confusion as to what I'm talking about. There is a pause between when the animation ends and when it loops back to the beginning.
Help me please! I'm new at Flash and don't know a whole lot about it.
Try making a new layer and putting the same animation on that but make it start later. With them both repeating one after the other it sould look like theres no pause but if not then you can try adding a 3rd layer and putting yet another animation on that even further down the time line .
Try starting in the middle, and finishing in the middle. At present you start with a blank image; after the first loop, this is boring. Providing you animate it carefully, you should get the illusion of a constantly-moving stream of bubbles. If that is what you want.