As Mike said focus on the area you are seeing the prob so not to mess your tank up to much. As said when I saw them this what I did. I turn the power heads off take the leather with rock that was surrounding it and without shaking them in the tank to avoid any falling off. I then wash them off in a bucket by turning them upside down and taking a turkey baster and flushing them with it so as everything falls from the to the coral and into the bucket. Its been over a week and I haven't seen any more since.
Did you find the info on them from the link on other treatment to try?