diatom ?

blowfish

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is this diatom or brown dust algae?
and
at the same time the second photos shows a coral that all of a sudden the lower part turned into this black brown thing that encapsulated the existing coral part.

diatom.jpg


black_spot_coral.jpg
 
the water is still clear but turned into clear brownish water
 
not sure on the first pic, but the second one looks a lot like cyno bacteria to me


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