I had much the same experiance as Doug and did things much the same as him. Howeer after a couple of months, it seemed the worms were back, and I could not find any of them anywhere.
SOooooooo I know this is bad, but I was desperate. I took all the rock and substrate, and tossed the substrate. Then all the rock went into the bathtub on cold water. Pure Cold. Within and hour low and behold, out of the rocks came a worm about 3" long and maybe half an inch wide. So I figured I killed my rock, and there was no turning back now, sooo, I drained the tub, and refilled it with Pure hot water, and I mean so hot you can't put your finger in it. Within 5 minutes out came another bloody worm, this one about 6" long and about 1" wide. Now I figured I had them all. Sooo the rock went out onto my back porch, where it was throughly power sprayed. It sat out overnight to dry, and in the morning I brought it inside where it sat in cold water for another hour, then in a bucket to dry, then into one of my African Cichlid tanks, where the juvies would eat anything on the rock still. That night, I happened to notice the juvies, about 12 of them, attacking a certain hole in the rock, and I was curious to what they were doing, so I stuck my arm in the tank and turned the rock so I could see what they were doing, BLAAHHHH There was the head of a worm no shorter then a foot long and atleast an inch and a quarter wide, it was toast and the cichlids were eating it. Disgusting! So the point is, some of these little buggers are the most horrid creatures on earth and despite your best efforts at removing them, sometimes you will have to kill your tank to get them. maybe I went off the deep end, but at the time it was all I felt I could do!
