I think it's great they let visitors see the inner workings like this. I visited the aquarium in the mid 1990's (when it was relatively new) and remember it being quite nice.
This reminds me of Reef HQ in Townsville, Queensland which has a large central, open air reef tank and visitors can take a look at it from the roof of the building.
@Arizona Docent The infrastructure required to maintain aquarium exhibits is so big (perhaps larger than zoos?) that it is always nice to get that 'behind the scenes' peek.
