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I used a switched power-strip in my first tank, a 90gal mixed reef with sump. When I turned it off, my return pump, skimmer, chiller, and powerheads all turned off. I did this when feeding, cleaning, or water-changing.
About 2 years in with many fish, I was feeding phyto after lights-out so everything was off. I forgot to turn the power-strip back on before going to bed. When I awoke, all my fish except for maybe one clownfish was lying dead on the bottom. It was a terrible realization that they had died because I forgot to flip a switch.
That was my motivation for my current tank to use an APEX controller and a controllable power-strip. Now when I feed, I hit a button and all my flow stops for 10 minutes. It automatically turns back on and I can easily check any time that water is flowing from my return pumps (flow sensors).
Always double-check your return pumps are on before leaving or going to bed. Lack of oxygen can kill your fish in less than 8 hours.