Edrock summed it up nicely. I would only go back there if there was a fish emergency, and I needed something desperately. Although the selection is better than most places I refuse to give them my business because the staff was extremely rude, aside from one gentleman who helped me in fish once. . . , and their prices seemed were so inflated. Its a shame they are so close to my home.
Although their selection isnt as big as Vienna Pets, the people at Fox Mill Pets are eager to please. If they dont have what you want, and you cant find it online, they offer to order it for you and it should be there in a couple of days.