Yes its enough to ser everithing
Yes, you can see everything within 1hr or so. Watching the different types of fish swimming overhead is a great experience. You'll enjoy it.
Yes
Yes.. Its not huge.. Or for the matter of fact big.. :) unless you have plans to count each fish .. You will be done in 1.5 hrs max. That too if you are enjoying it.
Yes. You will be able to see everything.
It's not very big, so I'd say yes if you only want to see the aquarium part. There are some augmented reality show and if I remember right the last showing for that is at 15:00.
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