+1 kman. I used Flatworm Exit. I vacuumed out as many as I could with small water change (about 5-10%), then dosed Exit as per directions, then vacuumed out floating bodies after recommended time, then completed second water change with same water quantity as first. After about 3 or four doses with several days in between, I purchased a Sixline Wrasse and he's maintained the tank ever since. Been over a year since I've spotted one now. Good luck.