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On some of my LR I've got these clear tube-like figures protruding from the rock. They don't move around, but they seem to be popping up all over the place. What could they be?
Clear tubes? Hmm, the only thing I can think of off the top of my head, and with no picture would be vermetid gastropods. They are a snail that lives within the rock. They form small tubes to send out a mucas trap to collect food particles/detrius.