Cylinder attached to rock

draxus

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Not sure what this is, seems attached to the rock and is blowing around with my water flow. Very tiny
 

ISpeakForTheSeas

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Not sure what this is, seems attached to the rock and is blowing around with my water flow. Very tiny
Does it expand/contract or extend/retract at all? Does it just blow with the water, or does it sometimes move on it's own regardless of the water flow?
 

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