Just wanted to make sure that people remember to do a FW dip or Lugol's solution dip before adding things to your tank. I added some calupera lastnight without doing so and in my haste introduced a not-so-nice little predatory snail. Killed 2 astreas overnight. Luckily I caught it in the act and the 3rd was saved. Just a warning to you all!!! I'm glad i didn't have a clam, because i'm sure it would be toast.