I know. I make it clear that there are fw's in my tank. I was just making a point so people with them do not get discouraged and either not sell their corals or to try a remedy that may do more harm than good...There are a lot of natural ways to rid yourself of fw's without having to use Exit, or such. I'm not saying it is a bad product, I just would not trust anything that kills all of a species that liquify in your tank. If you do use exit, make sure you do over the recommended water changes. I would say cycle the water 4-5 times over the next few weeks for a bad infestation. They release a poison that can kill many corals. Use a fish or slug that feeds on them naturally. Many wrasses are great for this and it has been said mandarin dragonettes do also, but I have not witnessed this behavior. Velvet nudis will eat them, but are bad shippers and I have not found them locally. But like I said, I really don't mind, it's not my show tank and it is just housing my corals for growing out.