Realize that the lost claw/legs maybe an attack from another crab. They can be territorial. Or the Spiderman shell may have had something toxic in it, They are VERY sensitive.
We had some years ago, they did fine for a year, but forgot about them when the exterminaters cam in for the ants. Even though they were high, and the spray was only on the baseboards. Bye-Bye!
The kids survived. They need to learn that everything has a life cycle. And the Royal Flush Ceremony can be a good thing for them to learn.
