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I am trying to calculate how much substrate I need so I can decide which way to go (amazonia or DIY depending on cost) and need to know how deep everyone has their substrate.
But I've also created very deep sand beds for other types of aquaria and never had the (mythical, in my opinion) problem of "deadly gas build-up". So while there may be an optimum depth, to some degree experiment and find out what works best/looks best for you.
Thanks all
does Tom Barr have a site with all of his tanks he has done?