Identify please

[ff.rice]

Ok folks.... Help again. What are these? The best I can come up with is barnacles.... Is that right? Are there different kinds? And are they ok in my tank on my love rock?!?! This is a zoomed picture and they were on the bottoms of a couple pieces of rock in my tank

 

[saltcreep1025]

spirobid worm

 

[ff.rice]

Thanks..... Are they normal? Are they ok in the tank?

 

[saltcreep1025]

yup harmless filter feeders. They can be a pain in the *** to get off of equipment, but other than that no worries.