We Don't Lose Our Class Goldfish - Penelope Rex #3 by Ryan T. Higgins

Penelope Rex has one fear-Walter, the class goldfish. So, when Mrs. Noodleman tells the kids that they'll be taking turns bringing Walter home, Penelope gets carried away by her anxious imagination. The weekend has a rocky start-from Walter ominously licking his lips to a sleepless night where the fish's bowl appears to move closer and closer to Penelope's bed. But after a mix-up with a donation box results in a visit to the local aquarium, Penelope realizes she might just need to confront her fear of Walter-in order to save him.