Help with a "display" refugium next to my display

ERB82

Sharks fan!
My friend is going to give me a glass 36gallon hex tank with a hood and stand for free. I thought it would be cool to run this tank next to my 50gallon glass tank as a display refugium.

Neither tanks are drilled and my display tank is sumpless. I was wondering if there is a reliable way to pump water back and forth without risk of a flood.

If anyone has ideas or knows of a proper way to do this please help me out.

Thanks in advance!
 
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