Identify

[Salty BC]

Can someone identify? New to the hobby just added these live rocks about a week ago. This morning I noticed this tentacle looking creature. I also noticed the slime/mucous on another rock.

 

[Crabs McJones]

1st pic is bristle worm, not sure on the second, maybe sponge growth?

 

[Sharkbait19]

First one is a bristle worm. They are very common, and you likely have a lot more. They are good detritivores but will spread too much if the tank is overfed. They aren’t harmful, but can be a bit unsightly.
For the second, I was thinking some type of tunicate, but a sponge is also possible. Either way, a neutral/beneficial hitchhiker.

 

[Salty BC]

1st pic is bristle worm, not sure on the second, maybe sponge growth?

Should I remove the bristle worm?

 

[Salty BC]

Should I remove the bristle worm?

 

[Crabs McJones]

Should I remove the bristle worm?

Nope, harmless. Good detritus feeder. Leftover food ect...

 

[tREEFarm]

Unrelated - Who Dey?!

 

[Salty BC]

Unrelated - Who Dey?!

For sure!