thanks to everyone. I have disinfected the large empty aivery and letting it sit in the sun for a month! the new aviary gets more sun in winter (we are going into winter now) and my one male and three females are in there.
The three chicks are now three weeks old and getting bigger all the time and I can introduce them when they are big enough.
PS the female with the yucky ingrown feather thing is looking amazing! she must have been in a lot of pain before.
I am much more hands-on with my quail flock now and I think I will roof the old aviary as wet ground may have been one of the problems with that disease..?
cheers for all the help like vtspilotcar said - it's all about learning xx
What was the name of the antibiotic you used?? Thanks