Sponge?

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Jam

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I'm pretty sure this is a sponge, It quite fast not sure what kind it is and if it's good or bad. I have a growing in two spots in my tank. The biggest one is starting to grow up the wall and they are mixing in with the bottom substrate.

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Not sure if it's a sponge. Never seen a Sponge with Substrate imbedded in it.
 
What else could it be ? It doesn't move around except for when it grows lol
 

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