as far as i know they stay tiny, i've seen large colonies of them and the heads r all about the same size as these small pieces. My lfs still has the same piece from a month ago and it is still pretty expensive (probably the reason it hasnt sold) its about 6" and has the same tiny polyps, there is a name for them, "Eguchipsammia" and it is a dendro as Qukwzrd stated, but there's almost no info about them out there. i just thought it was ineresting that LA didn't really have a definite name for them. They must be pretty new or rare, one of the two.