I have a green/purple acropora about the size of a softball,and a tan acropora about the size of a dollar bill ripped in half,with 3 stalks that look like horns.Yhe tan acropora has green bumps,that I think are polyps that will open up,but I don't know because the guy at the fish store just gave it to me for free without me getting a good look at it.I don't what kind either of the acroporas are,but as soon as I can figure out how to work my photo software,I will resize the pictures and post them.