I've had sea monkeys two times before, and both "tribes" of sea monkeys had unfortinate ends.
The first of the tribes where given to me when I was five, I would always check up on them and watch my mother feed them. Their unforinate ending was by my cat. He jumped up to where we kept them to see what they were, when he had watched them for a few minutes he decided to rub up against their tank and dropped them.
The second tribe of sea monkeys died of to much sunlight.