I understand that leaf litter is organic matter. I was just thinking of something a little more broken down.
I have a very limited understanding of the dynamics of rainforest soils. When I have been hiking through both primary and secondary tropical rainforests I am usually looking at the flora and fauna not the soil. From what I do remember the layers above the clay had a 5 to 6in layer of humus on them. Where we would hike where there was no humus it would be next to a stream/river, so obviously there would be no buildup. The clay/substrate here looked very compacted. Again like I said a very limited observation of the substrate.
In the tanks that I will be building up I will use just leaf litter over Brent's "Dirty Old Man Performance Subsstrate". Within time a layer of humus might or might not build up.
-Dave
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