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Re: coal and black substrates

To: Aquatic-Plants at actwin_com
Subject: Re: coal and black substrates
From: spushak at CCGATE_HAC.COM
Date: Mon, 31 Mar 97 11:22:08 PST8

     Best to use activated charcoal not coal to get a nice dark substrate. 
     It also has the side benefit of absorbing many dissolved hydrocarbon 
     compounds such as humic acids or even H2S.
     
     Steve

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