Can anyone tell me the trick for night fishing for crappie? I have used both the green light, and a floating white head light. Sometimes it works great, and other times there are thousands of fish on the screen and they won't bite anything. It seems like the white floating headlight has worked the best for me. I have no idea what I'm doing wrong. When's the best time to try night fishing with lights? I know it has to do with the moon cycle somehow...?