Worm- Good or Bad

Last night I was checking out the tank with a flashlight when this guy came wiggling through the water. Not sure if it is something I want in the tank or not. It is about 3" long and when it stops moving (rarely) I do not see any noticeable bristles on it.

001-1.mp4 video by Nepenthesnut - Photobucket

 

Looks like a harmless bristle to me.

 

I got rid of the one i found in my tank i have read they can grow HUGE !.....

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Well, I put it back in after reading the response from Corailline so we will see if it turns into a monster or not!

 

I have quite a few of those in my tank...good guys to have. Yours sure moves fast in that cup though. lol.

 

Mine is probably 3 ft long now and 4 years old and in a 28 gallon.

 

What is the diameter of the thing at that size? I just can't help but imagine some giant furry moray coming out of the rocks while I'm moving a mushroom rock, latching onto my wrist and stripping the flesh in two tenths of a second!

 

Probably 1/3-1/4 thick.

It lives in the same burrow as my yellow watch man goby.

Comes out and eats with the fish.

Bristle worms for the most part are hugely ugly but harmless.