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Worm castings are definitely a viable substrate. There's an old 2004 thread on here about a method by Brazilian Vladimir Simoes.

I've currently got a 2.5G tank setup using this method, with no CO2, and after a slow start, some of the plants are growing a little bit better. You can read about my experiment here:

I'm currently beginning to contemplate setting up a larger tank with this method, that has CO2 and better lights, to fully test it out. I think I'll likely borrow some of the knowledge from AaronT's soil substrate method, but using worm castings instead:

I hope this helps a bit.
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