Why do i only have 3 sea monkeys?

i purified the water for 24hours and then put the eggs in stirred it and then nothing happened for 3 days and i had them in a clean plastic tumbler but today my tank arived it is a seamonkey one the zoo one. so today i warmed the water up a bit and a few hatched but i can oly see 3 and i have transfered them to the tank help i dont know what i did wrong ?