Are these both bristle worms?

[The Guy]

Originally Posted by newreefer_59

there is a larger one that comes out whenever is feeding (about the girth of a small finger and 5" long or maybe more) These ones are much smaller and lighter in colour. is it fine just leaving them as part of my CUC? thanks.

There bristle worms for sure, some people think because they are not eye pleasing they should be removed from the tank. It's part of what's in the ocean and they help clean up trapped food and detris. I have them and they have never been a problem in my reef tank. I say leave them alone.