I fought them for almost a year plus. One turned to three, three to ten, and before i knew it I had hundreds that turned into possibly a thousands. I would have 50+ on a single mushroom I have a 180gl, with lots of coral. Those suckers Killed countless corals. I did the FWE three times, helped a bit but nonetheless they came back. Just as I was going to throw in the towel I gave in and took my chance with a six line wrasse as everyone was telling me. Happy to say, one month later, I've seen less than 20 of them. He worked and I'm happy. Good luck, I know it's the only thing you can focus on...they are ugly