Corydoras aeneus / aquarium cleaning robot

Corydoras aeneus is an aquarium cleaning robot. these days, aquariums are bigger and bigger. aquarium's windows are require a cleaning per a day.
This robot cleans big aquarium's windows automatically.It use electromagnets to climb a window. The robot consists of two parts, wiper parts and motor parts.
wiper part is in the water,inside of the window.
motor parts is in The opposite side of the window, the outside of the water.
wiper part has only wiper.But motor parts includes sensors, motors, cpu. When The motor parts are moving at the outside of the water, wiper parts are following and wifing the window while IR sensors guide the robot.