Re: How much bio active substrate in a 4 foot tank?
If your enclosure is only 12" high it's going to be tough. I really wouldn't recommend less than 6" deep. At that depth, you'll need 5.67 cubic feet of substrate. But that isn't going to leave much head room for your snake. That's a rough estimate that doesn't account for your drainage layer.
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“...the old ones ... knew in their bones... that death exists, that all life kills to eat, that all lives end, that energy goes on. They knew that humans are participants, not spectators.” -- Stephen Bodio, On the Edge of the Wild
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