i have a similar piece of the first pic in my tank...it shrivles up like that when i move things around in the tank, do water changes, and sometimes just becasue haha, for me its kinda hard to tell. i belive its a colt but im not sure as idk what mine is for sure but expect it to increase about 10x the size it is in your picture when fully opened. mine is an inch max when shrivled and 8-10" tall when fully opened. it is a pretty hardy coral so i wouldnt worry about it just yet. fast grower fun to watch!!