add horshoe crab to tank or no?

u never see them

 

so i finally decided to go through with it and hes loving it...i usually see him for a little while every day and i love watching him go down and coming back up with a bristle worm in his mouth....very characteristic hes only about the size of a half dollar and has only grown to that from the size of a quarter since about april-may he'll do fine for now in this setup i should hopefully have a larger one by time he outgrows this tank if not im sure the touch pool section of our local aquarium would gladly take him in if not probably mystic seaport