My advice is to stare at it as long as you can... Lol I put one in my 80 gal and only see it every other month or so! I love them for cuc but I never see mine
I want a starfish but so many of them r not reef safe. Plus I want something to sift. Would u recommend getting one?
Sand sifting starfish should be left in the ocean. They usually slowly starve to death unless they have large, well established, deep sand beds to eat the micro fauna out of. It takes a while for them to die. Then one day you'll see it's arms disintegrating and you'll blame it on some crab or something.