Titan,
I wrestled with flatworms for 6 months trying most of the idea's list above. No Luck they kept coming back, well they were never really gone. I tried Siphoning, fish that were rumored to eat them(which I question this because during the treatment I found out the worms are toxic), they may have ate some but I had a lot.
Anyway I finally decided to treat using FlatwormExit. I went from 1000's to 0 flatworms. I'm very happy and treating wasn't too bad with one catch. You must follow the directions careful.
When treating the things I found that were critical are.
-Dying flatworms release a toxin so Syphon as may flat worms as you can before treating. Less toxin release from dying worms.
-Active Carbon Filtering right after the worms start dying.
-Large Water Change - I did 30gals for my 75g tank + 50g sump(approx 100-110g total)
-Better to under estimate total volume a treat a little light. You can always add more or treat a 2nd time. Over treating can damage coral and fish.
-I left the medicine in for approx 4 hours, which is way to long. This turned several nice purple SPS coral brown. They are back and health again. It took about 2 weeks.
It only took 30-45min for the flatworm to die, but after they start floating in the water detached start removal of the medicine ASAP. This is done through active carbon filtering and large water change.
Summary: Would I do it again. Yes without question. I would just go lighter on the medicine followed adding the carbon filtering and water change much sooner. Shortly after they start dying.
Good Luck, If you have question you can email me at
mguile@comcast.net
Mike