What are these guys?

[cypike]

Have a few of them on the glass, sorry for the bad pic. I have a couple trochus snails in the tank, are they baby trochus snails or are or are they spirobid worms, or something else?

 

[neonreef3d]

some sort of filter feeder... not harmful

 

[EricR]

Spirorbid,,, common and harmless IMO

 

[SneaksMcdoogle]

Spirorbid, just scrape them and keep them under control. They have taken over 1 of my rocks capes