Unknown film buildup

bagerkirby

Hi everyone,
I am new to keeping saltwater fish and recently noticed a buildup of this strange film in my saltwater tank. Does anyone know what this is?
(Compared to freshwater tank image)
DCAA5F53-B09C-49AC-A497-EDC49191E919.jpeg
B42B519E-0602-4938-8E5E-439131C01A14.jpeg
 

StarGirl

Its probably just some kind of bio-film. Its normal to be on everything in a tank.
 

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