White spots for months

My angel had this white spots on the fins for months is very active and eats well some one told me it was ich so I did thevtreatment but its still there no other fish in the tank has it is there any way to get rid of it, is it ich?
If those spots been there for months yiu would have a)a tank overrun with it, most likely and b)a dead angelfish some time ago. The spots look a bit too elongated for what ich spots usually look like. And yea, there are ways to get rid of ich.
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