Black sponge REEF2REEF Saltwater and Reef Aquarium Forum

I've been told this is black sponge. Do I remove it? Will it spread?

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What is this black hitchhikera sponge?

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Black Sponge? REEF2REEF Saltwater and Reef Aquarium Forum

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Black sponge? REEF2REEF Saltwater and Reef Aquarium Forum

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Black sponge and encrusting organism?

Black sponge REEF2REEF Saltwater and Reef Aquarium Forum

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Black Sponge? REEF2REEF Saltwater and Reef Aquarium Forum

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Black sponge REEF2REEF Saltwater and Reef Aquarium Forum

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