Grey film on rocks?

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Oscar’s25Gal

Oscar’s25Gal

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My 25g has been running for 2 months. It is currently FOWLR. Recently I have noticed two types of white/grey film like things growing on my rock, so could anyone please identify them?

Here is a photo :

film1.jpg
film 2.jpg
 
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WHAT AMOUNT OF LIVE ROCK AND SAND SHOULD BE PRIORITIZED FOR OPTIMAL BIODIVERSITY/FILTRATION?

  • 100% live rock + bagged sand

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    Votes: 47 33.3%

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