Coral? Barnacle? Cucumber?

[davidflagg]

And here I thought I was at least decently familiar with most hitchhikers out there. I haven't the slightest clue what this could be.

Weirdest part is that it wasn't there just a few hours ago. Bare rock this morning.

 

[EeyoreIsMySpiritAnimal]

Looks like the end of a bristleworm to me

 

[ISpeakForTheSeas]

Just to check, is it still there?

 

[davidflagg]

Just to check, is it still there?

Apparently it's mobile, as it disappeared a few hours after taking the photos. Best guess is a bristleworm like the above comment said, but beats me where that fluorescent blue comes from. I've got bristles in my tank, but they aren't blue.

 

[Reefkeepers Archive]

Fireworm or bristleworm. DO NOT TOUCH IT WITHOUT GLOVES. they venomous