I've had many fish as a kid. Even one guppy had babies, tough only about 5 made it to adulthood. My room mate currently has an axolotl in the living room. It's kinda cool..
I love learning about marine biology and stuff-I'm planning on studying it in college, too I've always wanted to keep a huge tank, but it just seems like a lot of upkeep...
My dream when I was younger was to have a tank of axolotls, but it's kind of...not-100%-legal to have them as pets right now because they're endangered. I want to get a license someday to keep some, but I know that's almost impossible. Someday, though ^^