Help! White gunk on fish. What is it?

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Balloon Mollie has white gunk on left fin and top of head and upper back. What is it? Hopefully you can see the picture.
 

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Cheops welcome to the reef. I discovered this forum as it seemed to always come up when I googled a question. Finally joined, then chose to become a supporting member and later a partner member to keep the forum available for others to come. My wife @Ocean_Queenie and I started culturing copepods and phytoplankton eventually selling some on here as a hobbyist. Eventually we decided to try to make a career out of it so we are now sponsors as well. I love the Reef2 Reef community here and the wealth of knowledge. Thanks for joining us.
 
Welcome, glad you are here! You will probably get a quicker response if you post this in the fish disease forum.
 
Your other thread was answered and please refrain from cross posting which takes away from others who too are seeking answers
 

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