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Re: [APD] Hell Froze over-Redox probes and gas bubbles


I posted about a week ago wondering how you can measure the ORP in the 
substrate without getting any interference with the overlying water. This is 
just my curiosity, I'm not intending to measure the substrate ORP like you 
are. I am very interested in this data collection you are planning.

On a related note:

Preliminaries-I have an African cichlid setup in my home using Onyx Sand and 
Carib Sea African Cichlid substrate. I think the tank is about 1 1/2 years 
old or less. Lace rock for caves. I am growing C. spiralis, Hornwort, 
Duckweed, Hygro. polysperma and I think corymbosa. I use K2SO4, KH2PO4, and 
KNO3 plus traces and Excel weekly. I use Seachem substrate fertilizer tabs 
every 3 months as well. Plants are doing great, no algae. I change the water 
infrequently(maybe 50 % monthly), 38 gallons, 2 wpg, 12 hrs/day. HOB filter 
using foam block and a power head- an old Supreme Aquamaster I retrofitted.

Question: When I stir up the gravel I get a lot of bubbles coming out of the 
substrate. I smelled at the water surface and could not detect any H2S 
odor-rotten eggs. I stirred up the substrate and vacuumed about 4 months 
ago. Do you have any guesses as to what this gas is? The roots of the C. 
spiralis are being dug up by a pair of N. lelupi that have spawning 
intentions. The roots look great and no evidence of any blackness in the 
substrate. I used mulm in the substrate as you have suggested when I set 
this tank up.

Jerry Smith, Bloomingdale, NJ

>Message: 3
>Date: Mon, 17 Oct 2005 11:43:11 -0700 (PDT)
>From: Thomas Barr <tcbiii at yahoo_com>
>Subject: Re: [APD] Hell Froze over
>To: aquatic-plants at actwin_com

>Speaking of Hell, I have been making Redox probes like a mad man
>for some wetland soil time series test.
>I'll see if I can make a doze or so and see how the redox
>behaves as the tank grows in well and gets more estblished root
>Tom Barr

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