Either a dedicated fish room or a basement sump. Mine (105 corner) is a basement sump with an LED, a massive canopy, and a submerged standpipe and the only thing you get upstairs is a soft running-water sound.
Honestly, if the spousal unit is opposed, it is not going to be a happy situation. There are many other restrictions, like not using cleaners, candles, carpet fresh near the tank (spray glass cleaner in an adjacent room, bring just the wet cloth in). If you have a good canopy, and LED lighting, this can be a protection against chemicals, but again, your sump has to be protected, too: mine is 10 feet from the laundry area and is ok, eg. But crafting with volatiles would not be good.