Everything you wanted to know about SC aquatic life
Yes, the aquarium is small. It is two floors. You could probably see the whole thing in two hours if you don't care too much for fish. No where near the size of the Shedd Aquarium in Chicago or the New England Aquarium in Boston, but still a wonderful Air Conditioned option for hot humid summer afternoons. Yes, it is somewhat expensive, but discounts are available from a number of sources, and when combined with the Ft. Sumter tour, you can have two afternoons of activities for $27.
We loved it. The focus of the Aquarium is not to be a be-all, end-all collection of marine life. Instead, the focus is on wildlife that can be found in the state of South Carolina. This type of specific focus was refreshing, and allowed a depth to the collection that would be impossible with a broader focus. I learned more about flounders than I ever thought I would. Plus, where else are you going to see sea turtles? It was also informative to see the jellyfish in the tanks before I was stung by one later in the week. Hands down, the best part was to watch the Dolphins from the Aquarium's patio. They are not in plexiglass cages, but swimming (and, jumping!) in their native habitat. Delightful way to spend an afternoon.