If a u-tube loses siphon, it just means that your pump in your return section of the sump will continue pumping water into your display.
This is not good, but not that bad either, as long as you have measured the additional capacity of your tank, and not built your return section larger than that.
In this case, all that will happen is your pump will run dry, but no flood. To solve this, use a float switch set to turn the pump off if the water level drops too low. Add a second as back-up, and there should be no way to flood.
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