I have about a 12 week old serama cockerel that I hatched from some eggs I bought from a seller. They are in an 8x3 pen that is in the shade with a dirt and pine needle floor. I have been feeding them a mix of Dumor 24% protein chick crumbles (non medicated) mixed with 16% layena. He is housed with a few OEGB chicks about the same age and a few other seramas that i have hatched with him. The rest all appear fine. I went to get him out and handle him and work with his posing and I noticed he was staggering slightly and very unsteady on his feet like a drunk person. He doesn't have nystagmus (the eyes rolling when they are dizzy). I can't find any wounds on him, he doesn't have diarrhea and he is still crowing and trying to eat. What could it be?