Hi again.
Okay, it really does sound to me as if you do know a lot about things, – you are not unexperienced at all.
So you did many of the right things, and you have been aware of the right things.
I have not heard of a paro having fish-tb, but of course if you have had the disease it could spread, – best way to know to get someone examine the fish. Paros are not very susceptible to diseases, – not that they cannot get it, – but they are remarkably strong in that sense.
If it is tb, there not really a way to reverse that, I am afraid. And in my experience, if a fish is sick, – most of the time its irreversible, we do wish we could cure it, – but most times we cant.
I dont think I can help you more than than saying :
I do not know what disease this is, I really honestly question whether they are sick indeed by a sickness which you can cure, or if they are sick due to water related issues, and reactions to medications.
I do not honestly believe that you can help the remaining paros by adding more medicine of any sorts, –
I really believe that they do not thrive in hard water, and this will not help them fight off if theres something wrong. So the best you could do in my opinion is to – as I said in the first post, I think, – create an optimal tank, – and that would include extremely soft water (osmosis, rain), low ph – lower than 6,6, rather 5. Add leaves, humic substances are also important for paros.
I wish you best of luck with it.
Maybe someone else can help you, I posted it on facebook too.