Hi, we are new to trying to hatch duck eggs. We aren't having much luck at it. We put 42 eggs in the incubator and we are down to 5 or 6. Seems like every couple of days ones that had veins and seemed to be growing turned into a black blob or they made a blood ring. I can't imagine what we are doing wrong. We have the incubator that tractor supply sells. With the egg turner but no fan. Temp stays right around 99 to 100. Humidity level varies but doesn't get much above 70%. Any help would be appreciated because we would like to try again.