i still dont like pixels that are made in less than 5 minutes.
It looks great to me the way it is. Sure, a 3D-realistic jellyfish swimming animation in a background ocean environment would look cool too, but this is perfectly nice on it's own, it doesn't need all that fancy-shmancyness.
It could benefit from a less choppier-more sped up animation like 6dof said, it does seem as if it is going in slow-motion.
The framerate it pretty low... try increasing the ammount of frames with a higher framerate to make the animation smoother while maintaining the intended speed.
Thankyou for your feed back I was going for a very minimalist look.