The only catch: when it arrived, I saw the wire did not have a plug attached to it. So I could not plug it into the electrical outlet in my dollhouse.
Last week, I finally did something about it. When I soldered the lamps in my dollhouse, I had kept aside the male plugs they came with. I took one of those plugs, pried out the pins using nose pliers, stuck in the exposed wire ends from the aquarium, and pushed the pins back in place. And now, my aquarium works! Look at the happy little fishies :)