 Whoa! Slow sown
Peat moss: probably about a half cup sprinkled on the bottom for flourite or gravel/laterite type substrates.
You are asking for lots of trouble with the substrate combo you have.
You need to read all of Plantbrain's (Tom Barr's) posts on this list before you add any substrate component.
It is hard to simplify substrates but there are two basic categories:
1) one inch max top soil under gravel, low light (2 W/G), no CO2 or ferts.
2) 3 W/G+, Flourite or gravel/laterite type substrates, CO2, and heavy water column fertilization.
The litter will turn into a clay mud which will never clear. The top soil should have enough clay in it to suffice.
But you need to read T.B's posts and perhaps read "Ecology of the Planted Aquarium" by Diana Walstad, before you proceed with a custom substrate. Otherwise you will face too many problems and because of the frustration be out of the hobby fast.
Regards,
Steve Pituch | 
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