Branching Growth on Rocks. Algae or Invert?

[GHogg]

Hey! Just got back from vacation and checked on my tank. Noticed these semi-transparent (maybe purple?) branching organisms on my rocks.

initially I thought bryopsis, but it doesn't seem furry and seems more smooth and almost tubular. I have no clue the timeline for growth, but none of these were visible last Tuesday when I fed my tank.

The first picture shows the biggest right in the middle laying across the rock. There's several sprouts in a group there. The other picture shows a smaller one in a different spot on the same rock. I didn't use any live rock, and it likely would been introduced along with the urchin I purchased the weekend before last. The tanks about 3 months old.

How aggressively should I be searching and destroying?

Thanks!

(Reposted because the title on my last thread got mangled for some reason)

 

[blaxsun]

Duplicate, but I don't think it's an invert.

 

[GHogg]

Duplicate, but I don't think it's an invert.

Ya I haven't seen anything like it before. It has like a vascular shape, like it looks kind of like blood vessels. Super strange.

 

[blaxsun]

Ya I haven't seen anything like it before. It has like a vascular shape, like it looks kind of like blood vessels. Super strange.

It's probably easier to tell you what it's not. It kind of looks like a small leather, but I can't see clearly enough.

 

[GHogg]

It's probably easier to tell you what it's not. It kind of looks like a small leather, but I can't see clearly enough.

Ya it almost looks like a Kenya tree or something, but idk what they look like at their smallest. I also thought it might be some kind of Macroalgae. Maybe I'll move my urchin over to that spot and see if it crunches them down.