Its your bacteria working to break down the depris. its the end product. What it will do is sep out and float to the top. Or when you put your sand in air bubbles got trapped under the sand bed.
It is not air the sand went in year plus ago and I have never noticed it. Is this good and why did it take so long? it that the final stage to remove the nitrates?
It is not air the sand went in year plus ago and I have never noticed it. Is this good and why did it take so long? it that the final stage to remove the nitrates?
My understanding is to slowly turn the sand over by hand every other week. You could build up a large pocket of gases and a wrasse or other digging fish could disturb it if allowed to build up.
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