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Old 03-13-2008, 02:04 PM   #9 (permalink)
Hoppy
Aspiring Aquascaper
 
Join Date: Feb 2008
Location: Sacramento, CA
Posts: 75
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I don't think anything bad can happen from using any kind of activated charcoal in the substrate. At worst it is just an inert material which will occupy space. You can argue about what the benefits of using it are, but I don't see any controversy at all about it doing any harm.
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