Grey film on rocks?

Oscar’s25Gal · May 10, 2020

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 :

Thespammailaccount · May 10, 2020

Sponge maybe?

Oscar’s25Gal · May 11, 2020

Thespammailaccount said:
Sponge maybe?

That's what my original thought was, thanks!

ReefLab · May 11, 2020

+1 sponge. no big deal.

Grey film on rocks?

Oscar’s25Gal

Community Member

Thespammailaccount

2500 Club Member

Oscar’s25Gal

Community Member

ReefLab

Well-Known Member

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