Grins... If it makes you feel better, those clearish / whitish flat worms came along on our wall hammer. At the time, I was so new to the hobby that I didn't even know that I should have been looking for hitchhiking pests other than hairy crabs and mantis shrimp. I didn't want to dip it, as I was too afraid to damage the coral at that point, too. Believe it or not, but I actually picked each one off by hand using a plastic spoon. It took me a couple of weeks to get all of them, but since removing the last of them over a year ago, I've yet to see anymore. I was perhaps fortunate as they really liked the wall hammer and hadn't spread to any other corals. The ones we had definitely prefered to be near the edge where the living tissue meets the skeleton, which made it easier to spot and remove them.