Spot on duncan

ArchXIII

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Was wondering what this is and if it's normal? It's a bubbly looking growth underneath the top head of my Duncan. Didn't know if its growing a new head, or if somethings wrong.

20210212_194458.jpg
 
Looks like sponge growth. I would take a toothbrush to it and brush it off into a container
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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