Paul's best friend is a mouse named Frank. Paul and Frank decide to put a fish tank in their house. The fish they invite to live with them invite all of their friends! Before long, there are angelfish, blue runners, triggerfish and herring living in the tank. And the tank has to be made bigger and bigger as a school of goggle eyes, then wrasses, and cardinalfish move in! It is not long before the entire house is one giant fish tank!
