I dont know if its typical, but I have a colt tree that Ive had since about 2 weeks after my tank was set-up (a friend convinced me my tank was ready... ) It has done very well and it now about 8-9 inches tall and about 7 inches wide when the arms are stretched. It SEEMS hardy to me, but I'd go along with the mushrooms as nice and hardy
colts are easy and adapt to just about any lighting scheme but do better under higher light IMO
but shrooms and most all leathers zoanthid polyps. they are all good choices.
Mike