My sea monkeys didn't work?

okay this is my second time that i have done this. I brought some sea monkeys the other week from amazon and i first put the bottled water and put the water puifer thing in and leave it for a day and i did that and then put the eggs in i did that too but nothing happened. I mixed it like it said and then black dots at the top of the water was there. I left it for like 3 days to see if anything happened and notta. Ijust thought it was a dud or something. I ordered some more and i repeated the same process and the same thing happened, black dots at the top of the water. am i doing something wrong? Do i not stir? :/