Rose Bubble "Size"

[russianspy]

Hopefully within the next 6 months I'm setting up a 120 gallon soon to be reef tank. So i'm planning ahead.
I was looking to know how big the rose bubble anemone can grow. All the books i'v looked in don't say the size it can grow to. I was wondering if anyone knew or "better yet" has a Rose bubble that is large "4"-6"" and if they have any pictures.

 

[viper_930]

Most will probably split before reaching 12" across, but I have seen some (in person) that are more than 1.5 feet.
Here's some pics of my two.