I am so sad.  I was looking forward to this hatch from Thieving Otter.  I only had 5 hatch, and four of them failed to thrive.  The one I have left is bigger than the others were, but is not growing like I expect.  Today is day 6 after hatch, and I'm not seeing any feathers yet.  It has finally begun to gain weight, going from 8g yesterday to 11g today. 
I don't think it's the breeder, since plenty of people have gotten great chicks out of them.  The one that passed away today was a black one.  I was really hoping to get black from this hatch.  I have no idea what the one survivor is going to look like as an adult.