White spot on favites?

COOTS

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Hello all! New to the hobby! Is this white spot/substance coming out of my favites something I should be concerned about? It is located at the bottom of my tank in low to medium flow and medium lighting. Thanks for your help!
C6698C0A-3E48-47EF-A7A7-5619D6D49F1D.jpeg
 

vetteguy53081

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Hello all! New to the hobby! Is this white spot/substance coming out of my favites something I should be concerned about? It is located at the bottom of my tank in low to medium flow and medium lighting. Thanks for your help!
C6698C0A-3E48-47EF-A7A7-5619D6D49F1D.jpeg
Hard to depict under heavy blue lighting
Please post pics under white lights
 
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vetteguy53081

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Hope these are better. Thanks for your help!
Thanks for pics. It appears to be some sort of nudibranch but cant see whole body
Unless you placed it in there- get rid of it. While some nudibranchs which are few can be friendly, many are not and will cause havoc
 
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