Soft Spongy Thing on the rock

rahul123

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Some soft spongy thing started appearing in my 2.5 year old FOWLR tank's rock suddenly. I have not added any new thing since past one year.
Can anyone help what the thing is - good / bad?

20240317_082841.jpg 20240317_082629.jpg 20240317_082841.jpg 20240317_082629.jpg
 

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