Out of the two assassin snails in this tank, one has been wandering around since I put them in the tank, and the other had moved maybe two inches. I'm thinking the slow one was sickly, because I watched this unfold last night:
And today's aftermath:
Looks like I have a BAMF cannibal snail! Should I removed the shell/remains of the dead snail now, or wait a couple days and let Hannibal snack some more?