The idea come to my mind just because so many chores you have to do for maintaining the water quality of tanks in a fishroom with more than 10 two feet tanks. water changing is not only the most important action for maintaining the water quality but the most time consuming and in a nutshell not fun.
this system allows you to connect all your tanks to main water supply and also water outlet and sit back and see the microcontroller change water for you.
I am going to use a microcontroller (Arduino perhaps) and their modules ( realtime clock. relays and wifi ) .12v normally closed solenoid valves and tons of 1/4"tubes