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Old 01/11/2008, 03:22 PM   #11
m2434
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Join Date: Jan 2004
Posts: 2,171
Bubbles are common during sand be maturation. However the bubbles on the rock and powerheads could indicate nuisance algae. It's tough to say without a photo. If the bubbles are on top of the rock, I would definitely suspect cyano, or diatoms, for example, but if they are just under the rock, it could jsut be from the sand bed.


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