Yes, they do. I've seen it before as well. Funny since it was at a Petco too. The anemone I saw was definitely a haddoni (it had no visible verrucae, was in the sand, and -- this is hard to describe -- "looked" like a haddoni).
They also tend to move a lot quicker than gigs, in terms of rapid (for an anemone) contraction of the disk.