I had them originally in a large plastic tote with the smaller heat plate. But since there were so many of them, they were either picking on each other, or some couldn’t escape the mass of bodies under the heat plate. Either way, there were about 10 or 15 chicks with injured backs. Either pecked or burnt, tho I don’t think the heat plate would get that hot. But if unable to move away from it, maybe?
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In either case, moving them to the bigger pen solved the back injuries. No more appeared and the ones that had wounds started healing. But as you said, they seemed to easily get lost at bed time at first.
One thing is for certain, I’ll never hatch this many at once again!!
I wanted 20-30 chicks so ordered 60 eggs. The seller sent 96….