FWIW, we bought a house 3 years ago with a built in SW tank, and downstairs sump. It was just chance, but after we saw the house and the tank, it became a selling (buying) feature for us.
That's how I got started with this crazy hobby... And have since added a 2nd larger tank downstairs....
But we love it. The main DT tank (built in) is actually in the kitchen just in front of a large island. It is always the focal point, when we have visitors over.
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