Keeping brine shrimp for a long period

[explorethereef]

I can hatch brine shrimp but for about 2 days but after that they all die. Why do they do this? On youtube, they can keep them for a very long time. I want it to be east to feed my stuff but if they die all the time, it's hard to do.

 

[mr_X]

are you feeding them? brine shrimp isn't very nutritious anyway, so i wouldn't use them for feeding on a regular basis.
you can make frozen food that is very nutritious, that you can feed everything with, for just a few bucks. much easier and better IMO.