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Freshwater sponge in gravel?

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Above is a clump of gravel that I removed from my tank last week after noticing a white spot on the susbtrate. It didn't have any noticeable smell, even after I broke it apart to see if there was anything inside. I broke it apart completely but made sure to put all the gravel back in one spot to see if it would recombine like a sponge allegedly would. It appears to have done so.


Does anyone know what this might be if not a sponge?

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  • 4 weeks later...

If it is a sponge, that means you have some of the best water parameters ever! Have your tried to grow a small chunk of it? Like one pebble? I know theres some freshwater sponges in the US, is it possible that you brought in some hardscape, or something from outside?

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