Haha, that sounds like a worthy goal! And if she's starting to get excited about the tank going in, that's all the better
I think your little one will love it, too. Put the time-out spot by the tank once it's all set up! Whenever my brothers and I threw tantrums, mom would sit us by the tank and make us look at it. Not even two minutes, we were calmed down and entertained by watching the fish. I think it was rather genius on her part.