I always had fresh water
aquariums as a kid, but can't help you with the salt water as they were out of my price range and a bit intimidating.
On a hunch, I'll say once you get it tuned up it won't be too bad.
Yes, I considered fish pets, almost all of them develope personalities. The aggressive ones, timid ones, friendly ones,
defensive ones, fearful ones, protective ones and so on.
Watching an aquarium in a semi darkened room was often better than watching t.v.