Greenish Brown hard algae?

[SlugSnorter]

All my (dry) rock is covered with this greenish brown dark algae (except for the parts that are glue) . It is seemingly harmless, but the CUC don't eat it. It looks sorta like coralline, but thinner and well... green and brown. Not really worried about it, just not really sure what it is.

 

[Impala67]

All my (dry) rock is covered with this greenish brown dark algae (except for the parts that are glue) . It is seemingly harmless, but the CUC don't eat it. It looks sorta like coralline, but thinner and well... green and brown. Not really worried about it, just not really sure what it is.

Pics would really help I’m this situation so you can get an accurate answer!!