Bubbles coming from the substrate - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 04-06-2009, 09:45 AM Thread Starter
 
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Bubbles coming from the substrate

I have a tank with substrate from garden topsoil. It has been there for over a month now, has plants, and the tank inhabitants are Chinese fire-bellied newts.

Today, I noticed that some areas of the substrate are starting to rise. When I put my hand on the raised area, bubbles came out of it and this stirred up the soil.

The newts are in there, though they have ran to the other side of the 36" tank, away from the "eruption".

Would this be harmless to my newts? I did a water change just to be sure, after I pushed the soft substrate areas down thus releasing more bubbles.
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post #2 of 7 (permalink) Old 04-06-2009, 10:49 AM
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Does the gas smell like rotten eggs? If so, it is hydrogen sulfide (H2S).

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post #3 of 7 (permalink) Old 04-06-2009, 02:06 PM Thread Starter
 
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I didn't smell anything.
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post #4 of 7 (permalink) Old 04-06-2009, 04:03 PM
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this is a total total shot in the dark, but cyanobacteria (blue green algae) can form a matt on the substrate that traps air under it. it might be hard to see against a black soil.

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post #5 of 7 (permalink) Old 04-06-2009, 04:59 PM
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Being it is topsoil and topsoil generally contails organic matter, it might be acting like a compost pile and breaking down the organic matter. Is it generating any heat at all?

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post #6 of 7 (permalink) Old 04-11-2009, 10:58 PM Thread Starter
 
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Quote:
Originally Posted by fshfanatic View Post
Being it is topsoil and topsoil generally contails organic matter, it might be acting like a compost pile and breaking down the organic matter. Is it generating any heat at all?
I haven't check the water temperature, but I noticed that two of my six CFBNs prefer the land/dry area than the water. One of them occasionally hits the water but then tends to hang out on the dry driftwood. Will check the temperature but I was thinking that if the water's not cool enough, why would the other four stay underwater when they could easily get out of it?
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post #7 of 7 (permalink) Old 04-12-2009, 03:05 AM
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You can take a bamboo skewer stick and poke into the substrate once a week to release trapped bubbles. I do this with each water change.

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