Black sponge REEF2REEF Saltwater and Reef Aquarium Forum

I have this black sponge that hitchhiked onto my rock. Should I keep it?

Opinions on this sponge growing in DT REEF2REEF Saltwater and Reef Aquarium Forum

Black sponge REEF2REEF Saltwater and Reef Aquarium Forum

Black Sponge? REEF2REEF Saltwater and Reef Aquarium Forum

Black sponge and encrusting organism? REEF2REEF Saltwater and Reef Aquarium Forum

Experts-What is this black stuff? REEF2REEF Saltwater and Reef Aquarium Forum

Encrusting black sponge REEF2REEF Saltwater and Reef Aquarium Forum

Is this a sponge of some sort? I haven't added anything to my tank in months.

Help with Sponge overtaking frags REEF2REEF Saltwater and Reef Aquarium Forum

Sponge ok to have? REEF2REEF Saltwater and Reef Aquarium Forum

Is this a black sponge? REEF2REEF Saltwater and Reef Aquarium Forum

Sponge Eating Fish REEF2REEF Saltwater and Reef Aquarium Forum

Is this black sea sponge?? REEF2REEF Saltwater and Reef Aquarium Forum

Sponge? REEF2REEF Saltwater and Reef Aquarium Forum