Need help identifying algae or something else?

[Ahetrick74]

Need help identifying from the videos. With the white lights on it appears to be grayish/greenish/whitish and seems to grow in shaded places like crevices or the underside of rock. It had been slowly disappearing with some tooth brush scrubbing but is now returning with a vengeance. Can anyone identify and recommend treatment?
I do have a cuc with various types of snails, a conch, pincushion urchin, Peppermint shrimp, and various crabs. Nothing seems to touch it.
https://photos.app.goo.gl/PaVrXUZHcsBiWTda7

Nitrate - 15ppm -higher than I'd like but I only have softies.
Phosphate - 0.03ppm
Mag- 1300
Calc- 440
Salinity 1.025
Alk - 9

 

[captain_jimmy]

Following for ID, i noticed a bunch of this inside some of my rockwork today.
It is also growing in shaded areas, same as yours.

 

[captain_jimmy]

I've been doing some googling, possibly calothrix?

Reef Cleaners

A good guide to identify most of the nuisance algae that plagues the hobby. Complete with pictures and suggested treatments

www.reefcleaners.org

Do you run carbon? I read a thread that some people said they had this and it increased when they ran carbon.
I just replaced carbon in my sump and noticed this algae the next day. This could be coincidence, it may have already been there and I didn't notice...

 

[Ahetrick74]

I've been doing some googling, possibly calothrix?

Reef Cleaners

A good guide to identify most of the nuisance algae that plagues the hobby. Complete with pictures and suggested treatments

www.reefcleaners.org

Do you run carbon? I read a thread that some people said they had this and it increased when they ran carbon.
I just replaced carbon in my sump and noticed this algae the next day. This could be coincidence, it may have already been there and I didn't notice...

I just have a 40 gal so I've been running Chemipure pouches, which does have carbon.
Nothing in my tank will touch this stuff and it doesn't have any bubbles on it. Using chemi clean to treat red cyano didn't touch it either.
I saw a post on here somewhere about somewhere about something, I think it was called

Lyngbya.​

Here's the thread I started through...

Fuzzy stuff on the underside of rocks

Hi all! I’ve got something growing/accumulating on the underside of my rocks in one of my tanks and I can’t seem to identify it. It’s a grayish brown color and it brushes off the rocks very easily but also returns very quickly. It does not seem to grow/accumulate on the tops of the rocks, only...

www.reef2reef.com

But I haven't found a specific cause or treatment.

 

[Reefrats]

I just have a 40 gal so I've been running Chemipure pouches, which does have carbon.
Nothing in my tank will touch this stuff and it doesn't have any bubbles on it. Using chemi clean to treat red cyano didn't touch it either.
I saw a post on here somewhere about somewhere about something, I think it was called

Lyngbya.​

Here's the thread I started through...

Fuzzy stuff on the underside of rocks

Hi all! I’ve got something growing/accumulating on the underside of my rocks in one of my tanks and I can’t seem to identify it. It’s a grayish brown color and it brushes off the rocks very easily but also returns very quickly. It does not seem to grow/accumulate on the tops of the rocks, only...

www.reef2reef.com

But I haven't found a specific cause or treatment.

I have this as well and saw your thread. I don't think it is calothrix or lyngbia. Has yours gotten any better or worse? I just started Dr. Tim's re-fresh/waste away treatment in hopes it will help.