I raise my daphnia in 55 gal drums, Donna. When the green water disappears I feed 'em sweet potatoes or zuchinni. Puree it in blender- @2 parts water to 1 part veggie then squirt it into drum with a syringe. Baby food veggies will work too, as will bbs. But I'm a tight wad so I make my own. HTH-Bob http://naturalaquariums.com