if you have been to gatlinburg before, you know there are lots of different ways to part with your money. when we took the grandkids to the aquarium, i was not expecting much, and was pleasantly surprised!!!!! you can spend 1.5 - 2 hours. we went mid-march, mid-week, right when it opened....the crowd size was comfortable. by the time we were leaving 90 minutes later, it was certainly picking up.
i'm not sure the kids realized it, but we adults were super impressed with the 'slow walk thru the shark tank' (people mover rides thru glass enclosed area).