I've had some odd experiances with my green bubble tip. I've had it for a little over 2 years and within the first year it split twice. It has not split since then and is now quite huge (relative to others I've seen) and can stretch out nearly a foot in diameter. I've read that they will split either under stressful conditions or very ideal conditions... I'm not sure which would have been the case with mine. Here is a picture from two months ago.
