I risked my hatch by opening the incubator during the second day of lockdown. I did this because it was overcrowded and the hatched chicks were pecking at the pipping ones. I moved my Brinsea to the bathroom, turned the hot water on in the shower and gave it about 10 minutes worth of steam. I opened the incubator and removed the chicks, and replaced the top to allow the others to hatch. It appeared to be successful. 9 of the 12 eggs hatched. There weren't any rubbery membranes. Has anyone else tried this?