Coraline algae?

[Parrickt]

Is this coraline algae! I was positive it was and then I got into a rabbit hole and idk! My main concern is the green and I just want to make sure it’s not a problem

 

[Jekyl]

Don't think so.... how old is the tank? Is it on your powerheads and glass?

 

[Jekyl]

Rocks will change all kinds of colors and algae is normal, never something to freak out over.

 

[steveschuerger]

TBH is looks like a light coating of cyano to me. I can see slight discoloration on the sand as well I think

 

[AstroCoral]

My vote is for cyano as well, it looks like a slime on your rocks in the second to last picture.

 

[Parrickt]

the stuff on the glass and rocks are all encrusted on. its not like its a slime residue I can't reach the sand to feel it cause the water will overflow my tank

 

[SteveMM62Reef]

Cyno, a Soft Toothbrush will Scatter it. Coraline, a Soft Toothbrush will not appear to touch it. But, it will start to spread afterwards, in a week or two, after hitting it with a Toothbrush.

 

[Dude64]

I'd vote coraline... that stuff has to be "chiseled" off although I would absolutely not try to remove it... brush it like Steve said and you'll end up like .... (and this is after de-coraline-ing the filter body which I won't do again until clogging occurs)