There are a couple of efforts ongoing to try to replicate a more "rainforest like" soil.
I think the key thing to note which is a big thing I am fighting is that most normal substrates do not handle the extended damp conditions of our tanks. They break down over time.
At least for larger collections or well misted ones I am thinking that even fine aquarium gravel would be better than some of the common substrates, but don't quote me on that. :-)
I am going to test a couple of different things and see how they do over time as I think a number of other people are as well.
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