On Feb 12th I brought home 11 new day old chicks. 6 americana, 2 rhode island reds, and 3 gold barbanters. All 3 of the gold barbanters had pasty butt 2 days ago and I cleaned them up. However, one of the gold barbanters has significantly less energy than the other chicks. To the point of laying it's head down and just doesn't have the energy of the other birds. Is there anything I can do? I have them in a 4'x3' brooder with medicated feed and fresh water. The temp ranges from 90 to 100 degrees.