I live about 2 blocks from Fish 4 U and love that store. I'm in there almost every day. Their Aquatics Anonymous club is awesome too. become a member for free and get 10% off or 10% store credit on everything you buy except tanks and stands (but the store credit fro other purchases can go to tanks and stands)
Edit: Had to enter my opinion on The Aquarium
My daughter absolutely loved their giant waterfall and the store is gorgeous and well stocked, but the prices are too high and the store is too far. I'd only go there for something I couldn't find anywhere closer.