After that last episode where I posted about the "pod" that turned out to be an insect, I'm a little hesitant to ask about these. I think they might be some kind of sponge but would welcome input from someone a bit more knowledgeable. They are growing on the bottom of a stealth heater in a dark corner of the tank. I have two more of them on the bottom of an overhang on a piece of liverock. I also wouldn't mind knowing what those spiral things are that grow on the glass in that same dark corner.
