Sick Butterfly

I have a aruga butterfly in my hospital tank being treated for ich.
I have the salinity set to 1.009 for hyposalinity treatment which is working ok.
My real question for senior members is that one has a fungus like growth on the tail fin and one on his top fin.
The one is grey and the top looks like a small ball of cauliflower.
I'm trying to identify it before treatment.
I'm attaching a photo of the effected fish.

:help:

Thanks guys!

In the photo the ich has already gone. The growths remained.
It is now 4 weeks in quarenteen and they have not dimished.
Local fish store will return them this weekend if treatment does no good.
I think that it is lymphocitis (hope this is correct speling) as most of the web sites about it describes.
It is not severe and is only spreadable if another fish rubs against it but I don't want to endanger my main tank.
One site said to destroy the fish and bury it as it is non cureable.
:huh: