It could be one of the ribbon worm species, a possible candidate would
be one of the Emplectonema sp.; without a better close up picture it is
very difficult to pinpoint its identity.
Chris Carney
www.exotic-aquatics.com
SinusX wrote:

Hello
After year i found this in my aquarium "live rope". I've never seen this
before. I apeared sudenly, The smalest is only 4cm and the longest 60cm.
Here are the photos of this guy ? The are swiming by spining and roling.
www.pafcio.com/1.jpg
www.pafcio.com/2.jpg
www.pafcio.com/3.jpg
www.pafcio.com/4.jpg
As you can see head is gray and rest is green-blue.
WHAT IS THAT ??