My sister and I invested in those once.
It ended up being something like baby shrimp.
Another big thing was ant farms. I had one in my bedroom and my mother was horrified. She kept thinking the ants would escape in the middle of the night and invade the kitchen. They just ended up dying. Poor ants.
My ants didn’t make it, either.
I’m pretty sure we ordered the Sea Monkeys too. It was a fascinating ad and we just had to try it.