What is this: clear tubes

MaJuBo

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New build but the live rock in question was in my prior fish-only tank for 18 months and this wasn’t on it at that time. I’ve not introduced anything new except the sand bed. So, I think this is algae? The rock does also have some sand on it. Green hair algae, a red tree-like algae(?), and these clear tube things. Any ideas?

The snails also came from my 18-month tank.

I don’t know parameters other than pH which is low (7.3….I’m working on it) and ammonia is 0.009 ppm (Seneye)
0EE724EB-C2B2-4FF5-9E7D-3B9316098333.jpeg
AD775A92-8E66-4DB4-8C05-26EF89E866B2.jpeg
 
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MaJuBo

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Here are a few more photos. The tubes are flexible, dancing with the current, and are now on multiple rocks. I’ll try to post a video
IMG_6930.jpeg
 

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