Reef nutrition

Valentini puffer discoloration

Noticed my Puffer loose some coloration on his nose. Any idea what it can be?

I did add copper to the qt him but can this be caused by copper or some infection?

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He was rubbing his nose on the glass. And did notice him rubbing his nose on rocks earlier as well as a single spec on his top fin. I assumed it was ick so I dosed some copper. His nose appears worst as you can see in the picture.

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Puffers can be sensitive to copper, depending on which type you're using - cupramine or coppersafe should be ok if you're careful not to overdose. Do you have a copper tester?
 
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