The currently testing Windows version spans two or three monitors with ONE wide aquarium, not cloning or duplicating the same aquarium multiple times. Two regular monitors (4:3 ratio) will show
almost the entire width of the aquarium.
Using your current monitor in a portrait ratio may present some interesting challenges. The highest VERTICAL height of the aquarium that has been tested is 1440 pixels and it looked smooth then. So it might be a LITTLE pixelated at 1920 vertical res, but certainly MUCH better than MA2.