Algae Help - Good or Bad

[GovernorG]

Hey and thank you for taking a look and hopefully trying to help me!
I was looking at my rocks today and seem to have exploded with an algae outbreak. I do not know if this is good or bad, although my corals and fish seem to be fine with it. I have attached three (3) pictures, two are from the rocks inside the tank and the final one is when i took some pieces out. Any help is greatly appreciated.

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[OrQidz]

It's hard to tell from the pics, but is it kind of fuzzy? Looks like some kind of green hair algae. It is bad. Well, a pest and hard to get rid of. Looks like you've got quite a lot of it. What is your tank setup like?

[pyithar]

try rubbing off with your fingers. if it's hard and doesn't come off easily, it's probably the start of coralline algae.

[GovernorG]

Any other feedback? It is difficult to push off with my finger it doesn't look like green hair to me so I am pretty confused. Any other ideas?

[nuxx]

I don't think it's GHA either. Stuff comes off pretty easy... fighting it right now :(