Weird Stuff Growing

[LAMBrose1994]

Can someone please tell me what this brown leaf like stuff is please.



It is starting to pop up on my rock now

Thank You

 

[cloak]

It looks like some sort of macro algae. Sargassum hystrix perhaps?

 

[cchsoracle]

+1 on it being some sort of macro algae, just not sure which one.

 

[Petrocelli.N]

+1 macro