The most intriguing feature of the Bubble Eye Goldfish are its bubbles. The bubbles on the Water-Bubble Eye Goldfish begin to develop at an age of 6-9 months. By the time they are 2 years old, the bubbles are very large. These water-filled bubbles get so big in fact, that the fish has trouble seeing and can even have a hard time swimming because of them.
Although these are very intriguing looking fancy goldfish, their bubble sacs are easily broken. The sacs are notorious for getting caught in the water uptake valves of aquarium filters. It helps to have a foam cover over the valve to help prevent this. Most the time broken bubbles will grow back, but sometimes they may not grow back at all. And when they do grow back, they are a different shape and size and won't match their other bubble. Broken bubbles heal slowly and are subject to infection!