Hello I got back from about a 5 day trip and I have found these floating around my tank does anyone know what they are or if they are dangerous. it looks like a white "sack" with a "mouth" at one end? really not sure.
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Crabs McJones
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Pineapple sponges. Harmless filter feeders. Commonly found in sumps and overflows 
ichthyogeek
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Pineapple sponge. Harmless, something probably dislodged it hence why it was floating.
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