Can fish live in an excessively massive tank?

I ran across a photo of a millionaire household... of a fish tank (or a pool-like area attached to the property?) that is hundreds of gallons. Keep in mind that there's just about 12 colourful glow tetra fish. They don't need that much, but would the person cleaning it be able to maintain proper care of... show more I ran across a photo of a millionaire household... of a fish tank (or a pool-like area attached to the property?) that is hundreds of gallons. Keep in mind that there's just about 12 colourful glow tetra fish. They don't need that much, but would the person cleaning it be able to maintain proper care of them? It's quite hard to clean big areas with a body of water.
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