Hi all. So I bought some 15 snails yesterday at the LFS. After acclimation I dumped them in. Once in the tank I noticed one of the snails had what looked to be a zoa polyp on his shell!? It then slid directly off the snail and into a crevice of rock directly below where I had placed the snail. Is this a pest anenome then? It has a pink base and center with bright green balls at the tips?? Any help would be appreciated.