Sponge, algae, what?

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christa1421

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I received this Ricordea Yuma mushroom that came on a rock but it has this black stuff on it. I did a dip with coral rx before I put it in the tank. The mushroom opens up and covers it during the daytime, but at night, when the mushroom shrinks down I can see it. Not sure if this is black sponge, or a type of algae, or fungal infection? Should I try to remove it? I did gently go over with a toothbrush…doesn’t come off. So if it is a sponge hopefully I didn’t hurt it if it’s good.

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