Re: NANFA-L-- Bubbles from the substrate

Subject: Re: NANFA-L-- Bubbles from the substrate
From: Sajjad Lateef (
Date: Tue Dec 28 2004 - 08:38:06 CST

 Date: Sun, 26 Dec 2004 23:14:08 -0500
 From: "Todd D. Crail" <tcrail-in-UTNet.UToledo.Edu>
 Subject: Re: NANFA-L-- Bubbles from the substrate

   - ----- Original Message -----
   From: "Sajjad Lateef" <>
   My guess is that there is anaerobic decomposition going on
   in the substrate and the H2S is building up and slowly

  Hi Sajjad,

  It could be a lot of gasses. It could be CO2 released from the
  respiration of the biofilms processing the mulm (the films trap
  the CO2 until it can overcome the surface tension). It could be
  methane released by autotrophs in the same films.
  Or yeah, it could be sulfides.

  In my book, if you can't smell it, it's not a problem,

I stirred up the substrate with a stick and there were a whole
lot more bubbles that were released. The odorless gas is niether
H2S nor CH4. I am now thinking that it is likely C02.

The only new thing I can think of is that my house water supply
is now being softened with NaCl instead of KCl. That must have
activated some microbes into processing the mulm.

It's not high nitrates (the fish are active). But, I'll do another
large water change.



Sajjad Lateef  e-mail: sajjadlateef AT yahoo DOT com

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: Sat Jan 01 2005 - 12:42:07 CST