Crystal Light the Second is Karen Brewer's second goldfish that was given to her by Mrs. Porter after her first goldfish Crystal Light passed away.
Mrs. Porter was sorry to hear that Crystal Light passed away and allowed Karen to choose a fish from the pond in her backyard. Karen chose a fish that looked very similar to Crystal Light.
Crystal Light the Second resides in the playroom at the Brewer/Thomas house in a tank along with Andrew Brewer's goldfish, Goldfishie.
Crystal Light the Second appeared in Baby-Sitters Little Sister #16, Karen's Goldfish. After that, she has only been mentioned.