This funny looking thing…?!

[kase1084]

Uh, guys? It found this weird thing in my refugium tonight. It looks like an alien. It was just sitting on top of my chaeto. Because I have no idea what it is, I also can’t tell if it’s dead if it even is beneficial.

Is it a peanut worm?

Located in Sydney, Australia

 

[DSC reef]

I believe you're correct on the ID. Closest I could find anyway.

 

[BeanAnimal]

Peanut worm, put it back in. Almost certainly reef safe.