Black sponge at trachy base, is it a Good or bad one?

Broberg

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Hello
Can anyone tell me if this is a good or a bad sponge? The Black one. It is at the base of my trachy, so dont Think i Can move the coral away from the sponge and it is my favorite coral 😬

att.VA_cvenHZIk-Lo8_S0UEppc_ELkG5rZMB1mLVhd7wTA.jpeg
 
How do you know that it is a sponge?

@Broberg
If I was to guess, I would guess black Cynobacteria. Have you tried gravel vac?
 

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