Bubbles coming from sand....

Nitrogen gas. What is the nitrate levels on the tank? My tank(s) do this as well but nothing like that.
 
ill test the nitrates in a bit....from the looks of it though...very likely the diatm bloom...i have hair/diatoms that grew on my sandbed....overnight.
 
my tank is 5 years old and I see the bubbles all the time. The layer of green on top of your sand would be what ???
Bubba
 
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