Three is the magic number - you folks are right it seems - Dad is in the cage alone with them and their little hutch - not an ice cream box but a similar cardboard apparatus that I've had ready. He is feeding them and not seeming aggressive. The chick with the bloody eye is definitely a needy chick, very eager to be fed. Right up to dad, following close, and not getting aggression at all.
On another note, the (oldest) chick that dad lunged at two days ago seems to be trying to fend dad away, lunging and biting at him. he avoids he, feeds everyone else, then tries to go back to her, but again, she fends him away. She seems pretty protective of the other chicks. Is this typical behavior for older chicks?
Thank you, experts. Very, very much!