What is this?!

[Gonj]

This is my old dt I haven’t gotten to emptying yet but I noticed this on the glass never seen anything like it. Any idea what this could be ?
I used the live rock from this tank hoping it’s not anything bad I just put in my new tank.

 

[monkeyCmonkeyDo]

Sphaghetti worm?

 

[Gonj]

Sphaghetti worm?

Hm it doesn’t seem to have the base if so it’s just the stringy part

 

[monkeyCmonkeyDo]

Ya most are brown or tan too do idk without looking it up and or me being out of the hobby so long. Lol
Good luck! Hope u find ur ID!
D

 

[ssunthar]

Sphaghetti worm.. i have a few too.