Fin rot?

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Dwohlge1

Aquarium Advice Freak
Joined
Mar 26, 2011
Messages
292
Location
Ohio
My friends kids Pearlscale has a red lump on it's back fins and the fins around it look frayed.

Ammonia is 0
Nitrite is 0
Nitrate was a little over 20 so I did back to back 50pwc for them and it is now under 10 close to 5

Is this fin rot?
 

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