Christopher: Moina is small - smaller thanDaphnia pulex. They can be
maintained on Brewers Yeast. Just enough to make the water cloudy and set th
em in bright light - preferably sunlight to make the water turn green.
Periodically siphon the bottom to remove the gunk that accumulates and add
fresh water. Stand back and feed all the good "bugs" to your fish.
Yours, Harry Specht