What is this?

[MammothWombat]

Hello,

I have a couple of those things on the glass? Any idea what they are? Good or Bad?

 

[Gtinnel]

I can't tell in the picture but does it have 2 "whiskers"? If so likely a dorvillidae worm.

 

[MammothWombat]

I can't tell in the picture but does it have 2 "whiskers"? If so likely a dorvillidae worm.

No it doesn't.