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I don't know if it's what you're looking for as it's not a carpet plant, but nymphaea stellata (dwarf lily) builds huge root systems. When I removed the rather small one from my 29G its roots had spread to cover half the bottom of the tank (30" x 12") and aside from a few floaters it wasn't more than five or six inches tall. Plus they come in red, which is always cool.
 
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