AquaScum 2003

The AquaScum 2003 is a device that is installed in Philip Sherman's office fish tank by its owner, a dentist Philip Sherman, to automatically scan the tank with its laser beam for any filth after Dr. Sherman enters his office one day to find his tank dirty. Rather than taking the Tank Gang into bags as Dr. Sherman presumably once used to do, the dentist instead installs the device, thus sabotaging any chance of his pet fish, especially Nemo, from escaping the office.

Trivia

 * 2003 may be a reference to the year in which Finding Nemo was released.