In post #14 I replied with two answers (yes/yes) to your two questions.
Did you read the links? In the third link are the following excerpts. Basically, if you are using green water as a food for the daphnia, then you will need a strong light source. However, there are other sources of food for them:
"The smaller the container the more attention you will need to pay to the environment...food, water quality and temperature. It is fairly easy to monitor a one gallon container...we have done so many times and for extended period...on the kitchen counter."
"We have been 'experimenting' with several alternatives to greenwater. We have been surpirsed and plesed to find that cultures can easily be maintained indoors in gallon and five gallon containers. A one gallon glass jar can develop a colony of daphnia large enough to supply a few adult Bettas with a live menu item every other day."
"By accident (they do happen), be found that daphnia do very well on a product called "Liquifry." We grabbed for a bottle of another product we were testing and picked up a bottle of Liquifry instead...a drop per day in a one gallon colony seems to be the right amount...it varies with the density of the colony."
"Using a gallon jar and Liquifry allows a person living in a small apartment to grow daphnia."
"Some folks use a yeast and water solution for feeding daphnia."
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