Can anyone identify this Algae?

[alext56]

I’m fairly new to reef keeping and I’ve had my Fluval evo running for a few months now, with 2 Clownfish, 3 hermit Crabs and a Zoa frag. I started it with live sand and dry rock, and the filtration is only biological. There have been many different types of algae coming and going, but I’ve just noticed two areas of dark green algae that I’m not sure about. Could anyone identify this? And is it a problem, or should it be removed?

 

[blaxsun]

 

[taricha]

that black film is a cyano.

 

[alext56]

that black film is a cyano.

Thanks, I did think that, but I thought that cyano was only red

 

[taricha]

Thanks, I did think that, but I thought that cyano was only red

Cyano can be green, red, or Brown/ grey/black. I've examined dark brown or gray cyano patches like that, and found that in my system they were a mix of strong red and green filaments.

 

[alext56]

Cyano can be green, red, or Brown/ grey/black. I've examined dark brown or gray cyano patches like that, and found that in my system they were a mix of strong red and green filaments.

Thank you, is it dangerous? And should I remove it?