What bubble coral is this?

[chrislwp]

Have this bubble coral that open and extend out so big like nobody business. The skeleton is only 8", but the area it extend can fill up a nano tank. You can see my 3" tomato and 4" crocea mantle next to it.

Need to know the type of it cause I have a few other types but do not extend like this.

[chrislwp]

It isn't cateye, and yet appear slight greenish.

Look at the close pic.

[tigershark]

octopus bubble.. i own 2 of these bubble. the price is cheaper than cat eye.

[Tanzy]

Physogyra sp.