Greetings! I have an order for a bubble guppies/finding nemo cake. I saw a picture of a cake that had a tall (8" high about 4" wide) straight glass "vase" in between two of the tiers that I would love to duplicate. In the glass "vase" was bubbling water. The only problem I am having is how to make the water continually bubble.... a small battery operated aerator or something? Any ideas?

Like the ones in fish tanks? I have no idea how they work. You could ask at a pet store.