Green blue lepaestrea placement and growth

[r212019]

I just bought a blue and green lepaestrea and its in a cube shape

Does the cube grow or does the green and blue top expand over the cube edges and onto the rock that its sitting on?

http://s848.photobucket.com/user/r212019/library/

Here is a copy photos of it in there

Also, can I put it on the sand to grow?