

One of my colony of masked finches is unwell.
Bird seems to be lively but his condition has deteriorated in a couple of days.
He is short of breath, he lost feathers round his rump, and wings are in a mess (see pictures)!
I have not noted any excessive preening, or loss of weight yet, but I am not looking all the timeHe is now in a Hospital cage.
Any help would be greatly appreciated to help this little buddy recover. And, should I given any preventive treatment to his mates?