Last Saturday, Ursula the crayfish of Xavier Hall had grown much bigger. She had to shed off her skin since she had outgrown the old one. She was one of the survivors of the 'black death' in the aquarium had to be segregated from other fishes which got infected by some kind of fungus. Her companion, Sebastian unfortunately passed away much earlier but thanks to him, the experts manage to figure out what cause the death of the fishes in the aquarium.
Once the aquarium is stabilized, only then Ursula and some of the 'weaker' fishes will move back into it. Seeing Ursula manage to get out of the old skin makes me glad that she's going to make it. :) Hopefully, we'll be able to get another companion for her so that she won't be so lonely.