I got one for my small tank (10 gal?) since I have a lot of debris/diatoms/cyano etc. I have no fish or corals, just Caulerpa mainly. No sand, but pebble bottom, so he cruised the surface of the pebbles bulldozing my plants so I named him "Turbo". Not very imaginative I know. He would try to clean the glass walls periodically which was amazing to watch but he would also fall off onto his back so I'd have to right him. Recently he stopped moving and I noticed a yellow nodule on his black foot. He was still alive so I tried him in a separate small tank with more diatoms and sand, and Halimeda, but he didn't pep up. I scraped off the crusty yellow nodule the other day and after letting him recover a few days I put him back in the original tank. It has lots of cyano but he's not moving or eating as far as I can tell : ( I inverted him and touched his foot to see if he's alive and it seems to withdraw but he's very sluggish now. Any ideas on how to rescue him? I monitor the ammonia/nitrate/nitrite, salinity so I know those are OK, but have no idea what conditions would bother a snail. My other snails are doing great. I did see on another site that these guys eat "some types of cyano" so it's possible my tank is overrun with one type and there is little else for food, but I would have thought then he'd thrive in the other tank with sand, and a diatoms and other stuff.