I swear to god Cerith snails have got to be the absolutely stupidest animal on the face of this planet. I replace the first pair I had with 2 more a couple weeks ago. Today, one is laying on the sand upside down, I'm sure it fell from the glass and couldn't roll itself over. The other somehow used its pure genius to get its shell wedged in a crack in my live rock, i freed it from its rocky prison and it hasn't moved since. It's amazing these "short bus" snails didn't become extinct ages ago....... That is all, enjoy the rest of your Sunday.