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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?

 

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This is what it looks like underwater through the glass

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Same colony out of the water, Interesting surface texture.

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More stuff on another rock out of the water.

 

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