YOu need to dip it right away with 1/3 peroxyde 3% and 2/3 tank water for a minute or so.
Do it right away because this look like brown jelly and it's going to eat your duncan alive. After the peroxyde dip, return the duncan in the tank and it will heal. They are extremely tough coral and I once had that same brown stuff and used peroxide. The coral regained full healfh and it's now absolutely gorgious.
Also you need to feed a duncan to keep it at its best. They are photosynthetic but feeding them surely help them become strong and healthy.
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More fish die from human stupidity than any other disease...
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