Chances are that the slime will come back. I had a piece of driftwood that I placed in a bookshelf tank that basically had about an inch of slime all around it for about a week or two. Then just as magically as it showed up it disappeared. From what I was reading there is a bacteria that comes along and eats it and once its there you will never have problems with it again. I feel your pain though its so gross looking. Even though I boiled mine for a long time it still got it. So if you get it again just leave it in there and ride it out. It will disappear.