Dave Sanchez writes: > Hi all I need help culturing daphnia. i buy the eggs but they never hatch. > any ideas? I've read that the 'eggs', or cysts, form when the light cycle drops below a certain period per day. They 'hatch' when the cycle rises above 14 hours a day. This allows them to survive up north where the short day cycle signals the coming of winter. Try giving them more light per day. Bob Dixon