firstname-lastname Posted August 26, 2021 Share Posted August 26, 2021 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? Link to comment Share on other sites More sharing options...
Keeg Posted September 23, 2021 Share Posted September 23, 2021 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? Link to comment Share on other sites More sharing options...
T. Payne Posted September 23, 2021 Share Posted September 23, 2021 I don't know what causes these sponges, but I have several in different aquariums in my fishroom. I can't stand them. Link to comment Share on other sites More sharing options...
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