Are these diatoms?

ipubby

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20260923_165004_A8E04552-F32C-4922-A1E9-97B40F5CC814.png

My dry rock doesn’t have this brown stuff accept accept for my only live rock.
 
Hard to tell from the photos. If you post pictures under white light people can more confidently make an ID.

Tank is very young so you have a lot more adventures ahead!
 
Even if it's not I would consider it being part of the "ugly phase" 😊
Don't worry if it turns out to be something else. Within the first few months a whole lot of stuff can start to bloom but it usually also disappears on its own again. I think @slingfox said it beautifully:

"[...] you have a lot more adventures ahead!"
 

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