Drywall sanding dust got in my fish tank, tanks survived but I didn't

Last weekend I was sanding the seam compound in our hallway and didnt think to cover the living room entrance. My 20 gallon tank is about 15 feet away but that fine dust just floats everywhere. By the time I checked, the water surface had a gray film and my filter was sucking in dust. I did a 50% water change and rinsed the filter media, no fish loss but I was panicking hard for a couple hours. Has anyone else had a near miss with fine dust and aquariums or electronics? What do you use to seal off rooms during messy sanding jobs?

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