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Showing results for tags 'hitchiker'.
I notice this pattern on live rock, seems like something had chewed on the algae and leaved marks on it. What could do such things? Urchin? But I did not notice any around. Any other possibilities? On the other side there's some slime and some sand-like stuff (I don't have sand, my tank is bare bottom). This rock is partially above water, and the slime is above the water level.