Ajax must be close to neutral buoyancy, we have decided. Yesterday I spent a number of minutes watching as he happily crawled out along a fairly thin stalk, eating algae the whole time. He turned around when he got to the end of the stalk – don’t ask me how – and went back a ways, then managed to get onto a nearby stalk and do the same thing. It was fascinating to watch. He was prtty much wrapping himself around the stalk, which must have the bonus of letting you eat everything while helping you stay stable. Also noticed that you can see what must be the colon, or whatever poo-carrying tube snails have, inside the shell.