I don't know. My growth in my eggs doesn't look right. Only a few look like a bona fide "spider". The rest, well a few look like there's wispy lines all in one direction, or clear. Some of the yolks are not a blob, but a horizontal stretched blob. Maybe I should have candled before I set them. The ones with the growth do not look big enough, they should be further along. This is really furschtunken. I am glad I'm getting a new incubator today. I think this one would work much better for someone with 20-40 eggs. Not having luck with 12 silkie eggs.
