Unknown none fish ID Help please. very odd

[fisn-man]

ok so I was working on my tank and found this thing. I have never seen anything like this.

kinda a worm like thing.

 

[bang guy]

Looks like some type of Bristleworm. Could also be some type of Sea Cucumber. I'd have to see it in action.

 

[snakeblitz33]

Looks like some type of polychaete to me...

It doesn't have enough bristles on it to be a fireworm. I'd call it a type of bristleworm.