With the exception of acropora millepora, acropora humilis is a very common species of acropora that is imported. The difference here that I see is the first pic is a full colony while the second looks like it may have been broken and started to regrow in the wild. Like if the colony was broken by waves or however and started regrowing itself. They will grow out longer type branches but will never grow like a staghorn acropora. The branches will always stay or keep this type of "pillow" branch as Tyree calls them.
Check out Deuk's 180g sps tank on
www.exoticreefs.us/ under profiles to see some other color morphs of A. humilis. I have about 4 frags now of varying color morphs of A. humilis.
That isn't bleaching inbetween some of these branches is it?? I see about a half dozen spots that look bleached on branches and in the center of this acropora.
