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This was the thinking with the aquarium plants as well. Unfortunately the silting problems you get when you have a closed environment far overcome any theoretical benefits - drainage, for example, is moot when your entire ecosystem is underwater.
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Right? Trick is, you just need to soak it long enough. "Long enough" appears to be "more years than you are willing to deal with." The next move after "cat litter substrate" was "garden soil substrate" whereby people who will happily dip their plants in a 10% bleach solution for precisely 30 seconds were literally digging in fields and dumping it in with their cichlids.