View Full Version : Strange Worm

01/28/2008, 06:46 AM
Yesterday when I was changing the substrate in my tank I took out this worm thing. It is close to 4 inches long and has long sweeper tentacles. Does anyone know what this is and if it is harmfull?

01/28/2008, 07:13 AM
Jeez! And I was going to have spaghetti for dinner tonight...

01/28/2008, 07:30 AM
Looks like a hair worm or cirritulid. Good things. They come in different shades.
They look like this under the sand.

01/28/2008, 09:39 AM
Lovely worm. I do hope you put it back. It is one of the larger cirratulid polychaete species, AKA hair worm. Most of the filaments are gills which enable cirratulids to live in low oxygen environments. Up at the head end (on the left) are 2 to perhaps 30 pairs of feeding tentacles depending on species that pick up organic particles & carry them to the mouth. Some of the small species reproduce asexually by splitting into pieces & then regenerating the missing parts. These rapidly respond to the amount of food in a tank by population increases and decreases. A larger one like this probably only has sexual reproduction so unless you have a male & a female there won't be any more.