3 2inch and 1 5 inch. I see no snails, I have retested everything, and it seems fine. Lifted them up and nothing on the foot. It is not attached though. 2 250 20K halides over a 55 gal tank. 3in deep live sand bed. Inverts are snails,hermits, conch, small white crab (came in live rock) and a cleaner shrimp. Fish are a small clown, yellow T, and CB angel, lawnmower blenny. It is pretty established, a few months. Also The 1 Brown Clam (2in) seems to be great, while the Darker the Blue in the mantle the more that theuy seem closed. I have been feeding Photo, zoe, snow, ect. Also 3 power heads on a wavemaker for strong flow.