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?
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

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