What is this pink worm-looking thing?

[kiefers]

He will not hurt anything unless of coarse it gets ginormous! I have a few in my tank and they are cool to watch. They are great cleaners in the substrate. Just have ti keep them in check. If I see that I have to vacuum the substrate, a few little ones get sucked up so I don't have to touch them. Typically I vacuum at least one time every six months or so. That typically keeps the population down JMO

 

[tirtza]

I definitely want to get this fire worm out, I'm worried that it's not the good type that eats dead stuff, but the type that eats coral. Much later on when I'm ready to add some soft coral, I don't want this worm or any offspring to damage the coral. As soon as my refractometer arrives in the mail, I'm going to dip the rock and use a hypersalinity treatment to insure that I get rid of it. I'll be sure to be very very careful, I certainly do not want to get stung by that little monster. I really love the idea of using a white bucket, and placing the rock on a cup, thanks for the tips guys! You all are the best!

 

[tirtza]

woo hoo! The Fireworm (Polychaete - Hermodice carunculata) aka 'the evil fireworm' is gone, the hypersalinity method worked! As instructed, I used a white container and placed a glass at the bottom. After I mixed up the water to exactly 1.04 I wore rubber gloves to pick up the rock (the one with the worm in it). Then I placed the rock on top of the glass sitting in the white container. I turned the lights off and let the rock sit there for 10 minutes, and then returned the rock to the aquarium. Hardly anything came off of the rock. The only stuff sitting at the bottom of the white container was a little sand and of course the worm. I used some tweezers to pick it up and throw the little monster away. Thanks for your help Saxman and Spanko!