horseshoe crabs

Anybody have any experience with those guys, i took one in from someone who closed his tank, its about 2 inch. He said he ate detritus, but from what i've red, they eat more than that. They can strip your sand bed of all life and starve.



Any truth to that, i've got a healthy live sand bed , 150 G tank and i don't want it stripped of my fauna that helps in maintaining a stable tank.



Any thoughts on that? Thanks for your time