Very nice new aquarium in downtown Toronto. They don't have a huge amount of species but they do have some interesting ones and, as others mentioned, they are displayed beautifully. They have an awesome tunnel you go through where you can see a ton of sharks and large fish.
This is a great place to take kids. We saw everything in about an hour so I'm not sure it's quite worth $30 per person but kids are cheaper. I guess factoring in the downtown Toronto location it was not that overpriced...maybe a tad but it was still worth visiting and we enjoyed it.