Brown spot on chalice

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ourfirsttank

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I have a brown spot on my chalice as seen in the photo. I removed it previously with tweezers, but it has come back. What is it and should I be concerned? Thanks
IMG_4159.png
 
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VintageReefer

VintageReefer

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I have same issue on one and no solution. Algae grows there. I remove and it comes back
 
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