<a href=showthread.php?s=&postid=7565118#post7565118 target=_blank>Originally posted</a> by namas I would get rid of him.
He will eat all your pods that you want in your sand to keep it clean. At least that is IMO.
your opinion is wrong! those a mini bristle starfish. they are great detritus eater, and will help keep the sandbed clean. they dont get much bigger than 1-1 1/2" in dia. so if they do eat a pod or to they wont wipe out the population. this a treasured creatures in your tank.
i was judging by the pic didnt even read the description. if it is 4" then its not a mini star, but a serpent, or regular bristle. i still wouldnt worry about taking it out of the tank. if it gets to big then maybe take it to the LFS and trade it in.