Tom - I've set up a couple of fishrooms using the following approach:
In a nutshell, you need a way to drain water and a way to add water.
To drain, I have at least one DIY PVC overflow on each tank (draining to a central drain line...which either goes down the drain in the basement floor...or into the garden in the case of our garage fishroom in Cali).
To fill, I ran tap water to (black) 1/2" drip irrigation tubing hung from the ceiling of the fishroom (the main line)...and a branch line or two from the main line to each tank. Depending on number of tanks, desired flow rate and water pressure, you can control the amount of water to each tank via drip emitters. This is basically the same as if you'd set up a drip irrigation system for a garden...
Some folks use water purification systems, bins of aged water and pumps and timers (like those used for lawn sprinkler systems), temperature mixing valves, etc. to totally automate the system (I've done most of these on at least one of my fishrooms).
To keep it simple, I just add a little dechlor to each tank and run tap water from the closest utility sink to the main line (via a garden hose) when I get home from work (or some time in the evening when family members won't complain about use of hot water)...or whenever I get a chance.
When I turn the water on, water goes to each tank. And drains via the PVC overflows...
I still siphon the bottom of tanks and clean filters.