<span style="font-size: 13px;"><span style="font-family: Calibri;">My tank is about 8 months old and I just noticed about 4 of these things crawling around my tank. I am assuming it is a type of snail, I just hope they are reef safe. I have not lost anything yet, except for a porcelain crab (I hope he is hiding, he has always hung out in the open before). </span></span>