Tube anemone: growth rate?

[dendro982]

How fast the tube anemones grow in usual hobbyists' tanks?
Please, mention color and size of your.

I have the peach-pink big one, possibly Cerianthus orientalis, 11" (almost 30 cm) the diameter of open tentacles. Would like to know, what to expect .

Had a thought of setting tank for a several very small, grape colored with neon-green center, but without this information I couldn't possibly estimate size of the tank. The bigger - the better is not good enough, sorry.

Can they touch each other, or they should be at which distance?

Anything you know, please.