Fine red filament tentacles x

[weyfirstreef]

I have begun to notice at night I have very fine red/ brown tentacle coming from the sand at night. These are very thin almost fifty percent thinner then say the feeding tentacles from my war coral even. Maybe .5 to .75 inches long. They appear in small groups say quarter to fifty cent size.

Any help with what they are, hopefully they are good?

Input appreciated.

Thanks

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[ricomike]

Cyanobacteria possibly? Any pictures? Cyano is not a good thing but also not uncommon. Improvements in water quality might eradicate it if that's a potential issue. How old is the tank?

 

[Trevor]

Spaghetti worms?

 

[cstmpprl]

+1 on spaghetti Worms