Caulastrea 'Bubble'

[jklnbrg]

In my 12 gallon nano I have a Caulastrea colony. One of the polyps appears to have a 'bubble' under it's tissue. It appears to be getting larger. (see pic, top polyp)
Attached is a picture. Ideas?

 

[Kitty]

Just my .o2c, but I think it's simply trying to grow, and the next polyp is in the way. Do these polyps split to make more?

 

[jklnbrg]

So, the 'bubble' has been expanding today and in effect pulling and stretching the polyp toward the surface. A minute ago I could watch no longer and gently pressed on the 'bubble'. From the polyp's mouth erupted a stream of bubbles. :shock:

I'm guessing it was O2 generated by the polyp itself. Very interesting.....

 

[tnn1567]

Your corals looks very healthy

 

[ScubaLuke]

@jklnbrg wrote:

So the coral in a sence need some beano? That is very interesting.