Can anyone identify these things that stick to the glass?

vienna

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Every few days my back wall is covered in these things & in a few small random sections of the tank and sump. They stick on as well. Is it a bacteria or something more sinister.

20230803_130639.jpg
 

RedoubtReef

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It looks like algea. Try a pic with white light and maybe they will look different, hard to tell otherwise.
 
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