Duncan mucous?

Jackg962

New member
I have 3 seperate colonies of Duncan's. One in the bottom of picture keeps getting covered with a brown mucous like stuff. The bigger colony in towards top of picture has several heads getting the mucous on it. What is this? An do I need to take them out an dip them in revive or similar product?
 
oops here's the picture
 

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dip it in Revive or I have some Medic coral dip? its on the bottom colony with 2 heads. How would I cut the heads off of the big colony? How did I get this or how can I prevent it?
 
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