Thanks for your daphnia comments.
I, too, am trying to raise some indoors.
Right now they're in a 5 gallon bucket, but I am getting a 10 gallon just so I can see what's going on in there better.
What else can I feed them besides green water?
The lady I bought them from on ebay also sent a bag of dried flakes(looks like fish food), but she sent no info, and so far, I can't get her to reply to my query for info.
I love feeding live food because my fish seem to enjoy it so much more!
Is it possible to overfeed fish on live food?
I feed mosquito larvae in the summer, but am enjoying having daphnia so far in the winter.