Basically, you are talking about moving the camera farther away, so that everything in the tank is smaller. That's not an option for 2 reasons.
I've carefully selected the sizes for the fish to make them as clear as possible, with a 1:1 texel/pixel ratio. Any bigger or smaller, and you would see the problems which all other 3D programs exhibit, aliasing or blurring.
Moving the camera back shrinks the background. Where does the extra material come from? The coral on the sides would have sharp vertical edges where it used to end.
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