What is this Hard to remive brown algae?

roggy23

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I don't mind it but it's so hard to remove from glass. Is it diatoms?
Tank is established.

20230323_163402.jpg
 
I don't mind it but it's so hard to remove from glass. Is it diatoms?
Tank is established.

20230323_163402.jpg
Looks like either diatoms or more like a lyngbya that can be shaved off with edge of an old credit card or similar
 

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