Thanks for the answers. How do I know what it was that was stressing them out? I did everything the instructions told me to do. Thanks.
Hi,
Those tiny little fish bowl tanks they sell with them are hard to keep stable. With saltwater you need test kits to know what's going on. I got sea-monkeys when I was a kid, and dwarf seahorses, those little "tanks" are impossible for kids to know what to do to keep it stable, they don't tell you about parameters, or SG or anything else regarding saltwater critters.
Ocean critters are not developed to handle change, so even temperature dips stress them out. The ocean is steady, our little tanks are not.
It makes no sense to purchase expensive test kits to keep sea-monkeys (brine shrimp) alive. Most hatch them out and feed them to their fish within a day. Get yourself a good beginners book on keeping saltwater tanks, you may find there are way cooler things to keep as pets than sea-monkeys.