I bought a dozen bantam cochin eggs, received 26 from the breeder, but most did not develop. Only 6 were viable. I had good temp & humidity levels all through the incubation period. 3 eggs hatched on days 17, 19 & 20. Than nothing we are on day 22, occasionally I hear little cheepy noises, but I can't tell from which eggs as the incubator fan is so loud. How long should I let them go? Should I pull them out and quickly candle? Obviously I am VERY disappointed in the hatch rate, but the lady did state she thought the viability was would be low due to moult and season. here is onte of the hatchlings, so cute!