I didnt buy them to use them as a breeding pair. So i'm ok with them not being prime quality if and when they spawn.
I assume you're not planning to breed them? Meaning if they spawn you won't try to raise the clutch? The only reason I ask is because SA clowns tend to have blunt noses (as someone else mentioned) which is fine for enjoying in a tank, not so good to breed.
I would treat all the fish, even if they are not showing signs you know that it is in the dt now and can come back at anytime. You may as well rid the tank of it completly now or just treating the clowns is kinda uselesa imo
These clowns are cross between Snowflakes Ocellaris and a Percula. Not a lot of black so unlikely the Percula parent is a Onyx. I am sorry that they are not doing well. Hope they will pull through for you.