No, I believe they see us just fine. But I'm assuming the darker the room is when the tank lights are on, the harder it is for them to see us, since there is such a bright light by the fish, and we'd be faintly illuminated.
When you gaze through the top of the water, or look through one side at an adjacent side, you can see a significant reflection, but that's not what the fish see. This all has to do with refractive properties of glass and water. Also, notice how when you look directly through the aquarium, from one side to the opposite side, you can see directly through, and that's what the fish sees when they are looking out.