Please help identify this white thing on my hammer.

[shark8]

Hi,

Can someone please help identify or explain what this white string growing from my hammer coral? It’s attaching to my rock. It’s about 1-2 inches long. Also, it has some small white spots(2-3) on its body.

Tank is about 3 months old.
ALK- 8
Cal-400
Nitrate- 8
Phosphate - 0.00
PH-8.3

Thanks!

 

[Timfish]

A worm or sponge. But it doesn't look like anything I would worry about.