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Old 01/11/2008, 03:22 PM   #11
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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.

Our imagination is stretched to the utmost, not, as in fiction, to imagine things which are not really there, but just to comprehend those things which are there. ~Richard Feynman
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