No, it is not. You can see part of an aquarium from the atrium area, but you need to pay to go through the aquarium. Pricing varies and can be found on their site, but adults are around $40
No right now if you live in green county you can get 2 adult tix for 50$
It is $34 per person, you also get to go through the natural history wing of the museum for that same fee
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