Hmmm,

Interesting point... after I turned on my lights (left the rock to cure and
the tank to cycle with lights mostly off) I do have a bit of an algae bloom.
However I don't know how one can make a positive ID in terms of the
composition of the bubbles. O2 is certainly a possibility... what puzzles me
is how it is accumulated there.... there's really no algae at that depth
that I can see of. I'd much rather it be N2

Thanks for responding and the links I'll check them out.

Steve

"Boomer" wrote in message
...
More than likely the bubbles in the sand are O2 from algae and not N2 gas


Boomer

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"Mort" wrote in message
. ..
: How old is the sand bed?
:
:
: "SA" wrote in message
: ...
: Hi all,
:
: In my sand bed I see little air bubbles approximately 1/4 to 1/2 half
inch
: deep from the surface of the sand on the glass. Is that
de-nitrification
: going on? I thought that this occurs deeper in the sand bed?
:
: I have about 3-4 inches of sand on my tank and was hoping to benefit
from
: anaerobic activity, however right now I am not sure as to what those
: bubbles
: are. Trapped air... or actually nitrogen.
:
: Any ideas?
:
: TIA
:
: Steve
:
:
:
: