Hi. I've been stuck for a while on this. The goal is to tween a bubble coming from one circle to another circle while having a 'goo' effect at the exit and entry points. For the filter to have effect, I must place the bubble circle within the starting circle's group, then at some point before the bubble finished following it's designated path, remove it from that starting circle's group, apply the filter to the end circle, and append the bubble to the end circle's group. Does anyone have any thoughts on how to do this while maintaining a smooth animation?