green algae/plant??

[nickloeuf]

hey guys

there's this green thing that has started growing on one of my rocks!
i would like to know what it is and if it is good or bad?

thanks!

here's a picture

 

[Surfandturf]

hey guys

there's this green thing that has started growing on one of my rocks!
i would like to know what it is and if it is good or bad?

thanks!

here's a picture

Thats algae. While not bad, its not good either. Your rock looks absent of coraline so I am assuming this is a newer tank? Your rock maybe leeching PO4.