What is this and how do I treat it?

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Paxy

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Just noticed this on one of my tetras today. Any idea what it is and how I’d treat it?
 

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Looks like an ulcer,. usually from poor water quality. What are your water parameters?
 
I change out 15 gallons weekly in a 36 gallon tank. Here are the current water parameters
0EC2C81E-01BE-4205-88E6-A450ED5F2081.jpeg
 
It looks like Mycobacteriosis. If it is, it is untreatable, fatal and it spreads if left until the fish dies.
 

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