Hello could you help ID this

Marsha719

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Hi I have a few colonies of pulsing Xenia and I keep seeing the odd head floating around on close inspection I noticed brown stuff on them I just need to know what it is is it bad do I need to remove them etc thank you

IMG-20190425-WA0002.jpg
 
They don't blow off
 
I'll get husband to did them tonight when he gets home are they bad thanks for all the replies
 
They reduce the amount of light available to your corals. When they are alive they can grow and spread rapidly. They are not toxic until you kill them in your tank, I believe.
 
Ok thank you eek
 

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