The fish sent a message from up the waterfall. 

In chip monk aquarium there is not enough water in the lagoon for the fish to survive. Bob, Kevin and Stewart where chatting about leaving until more fish entered the lagoon. All the fish could do was leave the aquarium and find themselves a new home. Whilst they were talking about their plans a kid came by and wanted to buy some fish. He took a bucket of fish that included Bob, Kevin and Stewart. 

The boy took them home and the slept in the back of the car in a shiny rounded bucket.