White Spot

Well I’ve been treating the catfish for Whitespot but it seems to be getting worse which really wasn’t the plan. Maybe it’s some other parasitic infestation that manifests itself in lots of white spots? Can change the meds but not for a couple of days so the poor guy will be suffering for a while. Hope he doesn’t croak, we’ve had him for years!
This is the correct position for an upside-down catfish by the way!