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.
I would definitely not heat them and use the biggest container you have available. Lighting helps with growing green water. I have a garbage can inside I use to keep some usually, as well as I have used a spare tank at times. It can be hit or miss. It seems that if the food supply is insufficient, the culture will sort of go dormant by producing cysts. i don't spend a lot of time or effort on indoor culture, since i have so many for about 6 weeks every spring. I never filter the daphnia container but sometimes I will add a bubbler to keep the surface from scumming over. I have kept some outside over the summer in just a 3 gallon pail, with no care given to them. Hope this is of some help.
OOPs didn't see the date on this.
I've still got my Daphnia in a fish bowl which I haven't cleaned and they seem to be doing alright. They don't seem to be multiplying though (at any hugely noticable rate, though I do have more than I started with). If I insist on keeping Daphnia indoors, which I do, should they really be kept in a tank with a heater and or filter of some sorts?