I've seen pasty butt before, but I don't think this is what's going on with my chick. He has been acting sick: feathers puffed up and not very active so we moved him inside to see if we could help. His feathers looked matted last night and dirty when we brought him in.The plan was to clean him up this evening. When I went to check on him he had a large amount of whitish mucus like poo hanging from his vent. When my husband put him in the tub he noticed that he has poop stuck inside his vent and the chick keeps trying to pass it. He has been soaking for a good 20 minutes and it's still not able to pass it. The dropping in his bin are normal. What can we do to help him?