What is growing next to my GSP?

[yambeezy23]

I bought a small GSP frag from Dr reef a month and a half ago and it started opening up two weeks ago.

What is that reddish brown thing growing alongside my GSP? When I got the frag the polyps were all purple. Nothing looked different

 

[officialreefbros]

Hard to tell. So you only notice it on that side or also within the gsp?

 

[yambeezy23]

only that side! Super weird

 

[littlefoxx]

Anemone?

 

[yambeezy23]

Anemone?

I don’t think so. It hasn’t moved. Here is another photo at night

 

[19Mateo83]

Red macro algae? @ISpeakForTheSeas may know

REEF OF THE MONTH - May 2021: Tigahboy's Macroalgae Paradise!

R2R Username: @Tigahboy Build Thread: Tigahboy's Macroalgae Tank(s) Introduction: Greetings from Seattle, Washington! I’m super honored and thrilled to be featured this month on Reef2Reef. Although I go by Tigahboy and tigahboy.h2o online and in social media, my real name is Dennis, and...

www.reef2reef.com

 

[littlefoxx]

Its not xenia is it? Kinda looks like the polyp shapes

 

[AydenLincoln]

Definitely some kind of mamcroalgae which is good.

 

[ISpeakForTheSeas]

Red macro algae? @ISpeakForTheSeas may know

REEF OF THE MONTH - May 2021: Tigahboy's Macroalgae Paradise!

R2R Username: @Tigahboy Build Thread: Tigahboy's Macroalgae Tank(s) Introduction: Greetings from Seattle, Washington! I’m super honored and thrilled to be featured this month on Reef2Reef. Although I go by Tigahboy and tigahboy.h2o online and in social media, my real name is Dennis, and...

www.reef2reef.com

Yeah, some sort of red macroalgae - I'd need clearer pics to attempt a proper ID beyond that, but it looks like an ornamental kind rather than a particularly invasive kind, so I wouldn't worry about it.