I'm going to be remarkably clear - this aquarium is a complete and utter waste of money. It's expensive ($25 USD + tax) and the value is just not there. The queue to get in is long, pro-tip, should you decide to do this money waster, get your ticket in advance - you can just walk in.
If you've ever been to an aquarium in your life, you'll be severely underwhelmed as there is little marine life and it's dated AF. It's also not great for folks that have mobility issues or require strollers since the pathway is small. Save your money and do anything else Vegas has to offer.