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Is this anything to worry about? Black Sponge?

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I found these under the rocks in my holding tank today when I had to remove all the rocK to catch a Roayal Gramma that I was moving to the DT. I have read that chicken liver sponge can take over and foul a tank, but this seems really thin and not like the pictures I see on the interwebs. You guys had stuff like this? Leave it or bleach the rocks?



This is what it looks like underwater through the glass


Same colony out of the water, Interesting surface texture.


More stuff on another rock out of the water.


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