feeding daphnia

["Matt & Linda Crocker" <crockerm at peak_org>]

I'm trying to get a culture of daphnia going in a 10g outside, I had
filled it with water and added some guinea pig droppings.  After a
week I had green water and I bought some daphnia magna and put them
in.  5 days later the tank is clear and I need to feed them, I guess.
I have read about using yeast, but not activated yeast.  Is that
correct, and why not activated?  What are some other types of food for
the daphnia?

Matt