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That's a flatworm. Nasty buggers. There's flatworm exit, but they're toxic so you have to be ready with carbon and a large water change so your corals aren't affected. I'd treat three weeks in a row since some always manage to survive. Also, you may need to double or triple the suggested dosage depending on the worm. Best way to test is to get a gallon of tank water, put in some flatworms and add a drop, wait, add another drop until they're all dead. Then you know your drops per gallon. At least there's a treatment. There are tricks to siphon out as many as possible before you start too, DIY tools and attracting them to a flashlight during a lights-out period.
 
Dave, they definitely look like flat worms. This is a very tricky problem top deal with. In my experience, flat worm exit never 100% get rid of them even after a few doses and they just multiply again. As Anthony said when the flat worms die they release a toxic. This is why it is recommended to do a large water change and use carbon. The most dangerous part of this method is running all of the carbon. The carbon is removing the iodine/iodide and other important trace element from the water. I believe iodine may even have a greater affinity for the carbon then the toxin does. The lack of trace elements can significantly effect the coral a lot more than the flatworms.

I would siphon out as many as possible as much as you can often and add natural predators such as a melanarus wrasse, mandarin goby, and blue damsels. Trying to control the problem naturally is good way to start as opposed to making the water chemistry go haywire. If certain rocks, zoas, or acans are covered with flatworms and could easily be removed dip them in fresh water. They will melt instantly.

...sorry if that was too much chemistry. I am a chemical engineer by trade.
 
Thanks Brian,
I was looking for a natural cure and have been looking at a 6 line wresse or scooter bleeny, fresh water dip RODI? and how long?
 
We have a six line wrasse at the shop. He has been here healthy and eating for a few weeks.

You can either use RO/DI and buffer the pH up or use dechlorinated tap water. The flat worms we literally melt in 5 seconds. Don't forget to rinse off the rocks in another dip of tank water before putting them back in your tank.
 
Eric, we only use it sparingly. The volume of coral we hold makes it hard for us to keep iodine up the way it is. At the plant I work at we actually use activated carbon as filters to remove iodine. For the record...this is Eric not Brian responding.
 
I've been out a bit dealing with flatworms myself. I went the FWE route, did a weekly treatment/overdose for three weeks with my usual 25% water change and my corals took the hit, I lost a lot (after the third treatment). A month later and the flatworms are back.

I hate these bastards. I was really hoping to not get them this time. Giving up and going to try to get a predator to keep them in check.
 
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