Oh yeah , I forgot about sea monkeys ; another blast from the past.
I also remember in elementary school reading a book for a book report or some kind of assignment called " Gallons of Guppies' , it was about a kid that had bought a couple guppies and they kept multiplying and if I remember correctly he started a little business selling them.
Ahhh , the good ole days!
http://www.runyonsway.net/Henry Huggins/Henry Huggins Chapter 2 Text.doc
Teacher read it to us in class!