what type of algae is this

[paulydee67]

i was wondering what type of algae is this .should i brush it off.also what is the dark color stuff is on the rock.thanks

 

[Auto-pilot]

It's kinda hard to tell by the picture but it looks like hair algae. I usually brush mine off with a toothbrush

 

[RJinPV]

+1 on the toothbrush. Try to keep it away from the zoa colony because GHA is hard to get rid of in a zoa colony and they don't thrive well with it on them