Hey, My name is Stacey. Just got me a 10 gallon tank about a month ago. I got 5 damsels. 2 anemones. Emerald Crab. Sponge crab. an 3 blue leg crabs. When i first got my anemone i notice it had a shell stuck to it. I was like hey maybe i got a free snail. I keep a watch waiting for the anemone to let it go an it did, when i keep a good eye on the tank (the shell that was attached to the anemone) i started to see a worm looking thing come out of it. it dont bother the fish or nuttin. It is very small width but long. Looks like it has fillers as legs. it will go around the shell an it looks like it digs through the sand then go back in an stays there. But i cant find nothing on it an was hoping this would help. I am very interested to find out what it would be. Thanks!!!!!