Sorry, I can only tell you how to suck eggs as you're experience with Carl has made you the subject matter expert. So here is how you suck eggs - as you have multiple birds showing symptoms (and not all are necessarily related to the same condition) the cause has to be either environment or contagion. I see Fancy has given you some advice that will go toward resolving both of those possibilities. I just want to add my weight to the antibiotics point.
Triple C can be purchased from produce stores and pet vet direct places online and in store. In Brisbane it costs between $20 and $32 for 400g depending on where you get it from. I do not know what other over the counter ones you can purchase or what type for that matter for your conditions. Triple C is broad spectrum for when definite diagnosis hasn't been made. I have been given Psittavet - Doxycycline Hydrochloride under script to treat the infections my birds have. I don't know if you can get it over the counter. The bottle says script only.
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While at the vet picking it up I asked about Prazole tablets for worming. My vet doesn't like it but I only spoke to the vet nurse so I'll ask more questions of the vets if I have to pay for another consult ($120) in the future. I also asked about Moxidectin and Praziquantel the other treatments in @Fancychookladys article. Out of them and the Prazole and Levamisole it was their preference and they could get it in for me. Back to the article I thought the reference to ivemectin was interesting.
I wish you all the best and luck with your challenge.
The doxycycline is better absorbed and also dilutes better in water, but is script only. My avian vet charges $90 per consult and a tub of antibiotics is about $60 .
Lot cheaper than the equine vet. $1600 for vet check on horse just purchased and $450 for sedation removal of staples in the apsters bum and Scarlett's teeth filed back. She did leave a knockout gel for when we clip the mare though, easier than having to give injections. (We will be living on baked beans this month )
Yes get as much information from the vet as you can, I'm all ears when the vet is here, then I make notes so I can refer to them later.
There are veterinary sites on google that , while a little technical are far more beneficial reading than testimonials on blogs.