Hi there, I'm Jordan, I'm 16, this is my first time on Backyard Chickens and this is also my first time hatching campbell ducks (although I have kept ducks before). I bought 12 (two separate batches from different sellers with the hope to breed them naturally) eggs but unfortunately one entire batch had to be thrown out due to definite infertility. Two from the second batch were also infertile. One other sort-of-exploded (but not dramatically) so it was discarded a week ago. This left three, the three successful ones - or so I thought. I got up early yesterday (day 28 of the hatch) to check them. One had made a few cracks in its egg, the others remained the same. That was the trend for the rest of the day. Then this morning (day 29 of the supposed 28 day hatch) and the one with cracks possibly had increased the size of the cracks but I'm not 100% sure. The others remained the same. Rather dismayed I went to school and when I came home the other two had made progress, with one completely pipped, a pea sized hole with the internal membrane across it. Should I assist with the one who made the cracks? Is my humidity wrong? I am using an Octagon turning incubator and I'm not 100% what size I should have the opening of the air vent as the instructions are hard to comprehend. Help guys.