White growth on wall?

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pochitafish

pochitafish

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Does anyone have any idea what this white growth could be? The more translucent outer ring seems to be the new growth while inner section is older


 
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20251005_220152_1B5C0020-58DE-4946-A751-3E979556A56A.png


20251005_220152_59C032B6-E115-486B-8767-A190A8F349AD.png
 

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