I recently picked up some live rock and live sand. I have a 29 gallon Biocube I have been trying to sell and thought I might have better results if I sold it already set up. I put some gravel in it mixed with crushed coral and then put the live rock in. After a couple of days, I decided the gravel mixture just didn't look "saltwaterish", so I planned to remove it and put the live sand in there. As I looked into the bucket of sand, I noticed a few bristleworms had come to the surface. I couldn't find anything else alive in my "live" sand, so I took drastic action. I cleaned the sand in hot water a little at a time. That killed all of the bristleworms in the sand. Then it occurred to me that the live rock might have some bristleworms also... since it came from the same tank. I found out that they are nocturnal, so I went night searching with a flashlight. Sure enough... they are all over the live rocks. There is not a lot of life on the live rocks, but some... tube worms, one medium feather duster and some smaller ones. So, I came up with a couple of solutions. I could soak the rocks in hot water, which would definitely kill the bristleworms, but would probably kill all of the other stuff too. Then I found out that the bristleworms die if I drop them in fresh water even at room temperature. I don't know how long the other life could survive in the freshwater. Can anyone shed some light about that? Any better ideas about how to eradicate the bristleworms? Don't suggest the traps. That is a slow never ending process designed to control the bristleworm population. I want them GONE! Any help will be greatly appreciated.