The most common cause for a dying Artemia culture is overfeeding - ONLY feed if the water
is crystal clear - overfeeding causes the water to rot
The second most common cause for dying Artemia is a too high temperature.
If the temperature is over about 25C (77F) bacteria is growing faster and can harm your Sea Monkeys
Your Artemia are healthy if:
They swim fast, i.e. 1cm in at least 2-3 seconds
Their gut is clearly visible and full, meaning there is enough food and they feed