Help identifying hitchhiker

[benny_the_clown]

Hi there. New to the hobby. Currently have 55 gallon, about 5 months old, with a clownfish, royal gramma, firefish goby, and watchman/pistol pair, 2 cleaner shrimp, and 3 emerald crabs. One hammer coral and two zoas. Recently discovered a few medusa worms that we're just leaving for now.

Found couple of these in tank and not sure what they might be. Any help appreciated!

 

[Tuan’s Reef]

Harmless sponge

 

[benny_the_clown]

Thank you!

 

[vetteguy53081]

Not sponge but filter feeding tunicates which are reef safe

 

[benny_the_clown]

Ok, thank you!