We went the other day and I have to say that we were disappointed in it. I had a free ticket for teacher appreciation days and could get $9 tickets for my group. We all agreed that it should be part of the regular admission, not an additional fee. It's very small. We were able to see the entire thing in about 20 minutes. The one neat thing was these "bubbles" that let you look up inside some of the tanks.
Here's my little guy in one:
They didn't have a very wide variety of fish. I'd rather spend the money on visiting the Birch Aquarium in La Jolla.