Yes. But you have to reserve advance tickets online.
They are open by reservation. https://reservations.ncaquariums.com/fortfisher/Welcome.aspx Select the day and time you want to go. There is no time limit once you are there, we spent about 2 1/2 hours inside.
Yes. By appointment.
Yes just reserve tickets we just went and it is AWESOME
You can reserve tickets same day but it's likely they will be sold out for the best times. I had to reserve same day when I missed my reservation (which they refunded no problem).
Yes, visit website at least the day before going to reserve a spot.
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