should I be handfeeding the pigeon seed mix too? is there specific nutrients the bird needs? protein? (is that why you said peas? cuz i have frozen corn too, should I defrost that to feed as well as the peas?) fat? should i put calcium powder in the water?The dropping in the photo shows that he has not eaten for a while. Remove the heatpad (only keep him on the pad during the night) and put the water and food dish on ground level. Most important now will be to get him to drink and eat. Put him on your lap and dip his beak (not over the nostrils) in a small bowl of water. Do you have frozen green peas? Defrost a few and handfeed him about 15. His droppings will change when this gets digested and then you can feed 20 more.
Just open his beak and put one pea deep inside over the tongue for him to swallow. Have you checked for yellow growths inside his beak and back of the throat?
He is old enough to be eating on his own, but might be too stressed to eat now.