Black thing growing on Blastomussa

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Hi everyone,

I have this blastomussa I got around 6 months ago and recently I noticed this black thing growing from the base. It keeps getting bigger. What is it and should I be worried?

947CCE99-BD3B-4FE8-877C-2A323DD0094D.jpeg
 
Aquarium Specialty - dry goods & marine livestock

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