I think it may be stuff from my superglue. Nah that brown stuff is diatom that flew out of my sump after I accidentally started it back up without the filter on the pump. It was all over my tank, my cleanup crew has done a great job of taking care of it.
They could be sponges, but they also have a look like the hydroid stalks I had once. Have you touched them? Are they soft and jelly like or hard tubes?
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