Is this fish ill with Whitespot/fungus, or just discoloured?

[jordzcov]

Is this fish ill with Whitespot/fungus, or just discoloured?

Got 6 harlequin rasboras (now 5 as one died) on 18th of Feb to join 3 tetras in my 60L tank. I noticed one had a white mark and frail looking top fin (didn’t look severe enough toi be fin rot). I have treated with Whitespot and fungus meds every other day for a total of 6 doses (bottle says to dose every other day for 7 days, with an additional 7 days if required). It doesn’t seem to be doing much in terms of the mark, but the fish also doesn’t seem to be getting worse/ is still alive.

Just looking for some guidance on this one
Tank:
Nh3 – 0
No2 – 0
No3- 0/5
Ph – 8
KH- 7/8

Picture 1 is from MArch 16, others are from March 31

[plankton]

I can't 100% tell whether the area is raised or not, but it's a different colour altogether from standard harlequin. Is there a blue colour morph?
If it is a problem then it looks more like columnaris than anything else, but I'm not sure.....

[fr499y]

There’s a purple morph but that doesn’t look like one.