This a very interesting crab always on the go . It has been messing with the feather duster quite a bit lately but dosen't seem to have done any damage yet . Will it eat the duster and when I get some coral will this monster be a problem ? He is neat so I hate to evict him but I'm not after a crab tank . There was also a pointed crab that I recieved that molted as soon as he arrived and promptly cut some green stuff and stuck to his back so a picture of him that showes much of him has been hard to come up with . he dosen't seem to bother as much stuff as the bigger crab with the spongy looking back . Any help ? Thanks