Well, this is weird.
According to the description, that isn't just a fancy way to display your goldfish. When you use water in the sink, the water in the tank depletes, putting the fish in danger as a reminder for you to conserve water. When you stop, the fish tank refills. Um... is it just me or is that totally insane? Not to mention there are a lot of regulations about water temperature with fish, and I know they can be easily subject to trauma. Sheesh. This go green effort is crossing a line for even me.