What are these?

[Levinson]

I have a few of these grow on the acrylic surface inside the tank.
Kinda light brown, pink like in color. Looks like a plant root spreading out.
Sorry I couldn't get a decent picture of them due to where they are growing.
Any idea what they are?

 

[BanjoBandito]

Kinda looks like this?

Unusual growth on glass

I have read through other threads/posts on the site and there is speculation but I have not been able to find a conclusion on what is growing on my glass. My water parameters are normal and I test weekly. The growth is a 'vein like' pattern of material that grows either in areas of high flow...

www.reef2reef.com

 

[Levinson]

Kinda looks like this?

Unusual growth on glass

I have read through other threads/posts on the site and there is speculation but I have not been able to find a conclusion on what is growing on my glass. My water parameters are normal and I test weekly. The growth is a 'vein like' pattern of material that grows either in areas of high flow...

www.reef2reef.com

Hard to say since my ones are much smaller. Maybe the first pic in the linked post could be similar but the growth pattern seem to differ. I don't think they look like the ones in the second pic on the linked post.
Also, I don't get any on the glass.
Maybe they are variant of similar species?

 

[ISpeakForTheSeas]

Assuming they don’t swim around, do they come and go, or do they just stay where you found them?

 

[Levinson]

Assuming they don’t swim around, do they come and go, or do they just stay where you found them?

They don't move. They just stay where they are and I think they've been there for a while. They aren't really spreading fast and there aren't that many.

 

[ISpeakForTheSeas]

Alright. There were some posts a little while back with similar looking things (which, if my memory serves me, turned out to be colonial microscopic worms), but, like the shared link above, they were much and larger, and their tubes would come and go over the course of approximately a few hours.

 

[Levinson]

After some more search, I think I found what they are. They look just like these.
https://www.reef2reef.com/threads/any-idea-on-what-this-is.457231/

If the posts in the above thread is correct, thet seem to be Labyrinthula.