Electric switches!!!
These go in the wall socket and your pump, filter or whatever goes into the switch. I use it during water changes, where my setup involves filling buckets in the sink, and pumping from the buckets to to the tanks. The switch is way faster and safer than yanking on cords, which usually involves two hands because all of my tanks are on power tops or power bars.
This one (below) is even easier, and smaller, and is also permanent. It’s a cheap roller on/off switch that is very simple to install in an existing two prong cord. I have it installed on a
canister filter, and it makes turning off the spray bar for feeding super simple, and I don’t have to worry about losing the plug in the mess of wires beside the fish rack.