The most highly recommended plant substrate is usually Eco-complete for Planted Tanks. It's fairly expensive stuff, so you could mix it with pea gravel or another type of substrate as well.
You can use Eco-complete on its own. The more nutrients for your plants the better. I was just pointing out that at $25 per 20 lb bag of it, you'd spend a lot of money using pure Eco-complete in a 120 gallon tank. Mixing it with something like pea gravel will mean less nutrients for your plants but at a much lower cost. A lot of people have great success with mixed substrates though, so it's up to you.
AquariumPlants.com makes their own substrate that's supposed to be really good, and it's LOADS cheaper than eco-complete.
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