I actually grow almost all of mine in loosely packed sphagnum moss. For large pots (I have some 8" pots of Macodes petiola...), I fill the bottom half with LECA or styrofoam peanuts, and the rest is moss. They make a good hanging basket.
Ludisia discolor are grown the same way. I also have some ludisias in promix. They are doing OK. I've grown them in a large bark mix, coconut husk mix, etc. But for the plants I sell, they are all in sphagnum (more for my convenience than anything). I think that whatever you use, as long as you keep them evenly moist (and not soggy), they will do just fine.
Both species will take more light than you think, if you can keep the humidity up. They will tolerate quite high humidity (like in an enclosed vivarium). They are also fairly tolerant of low humidity, once established. Macodes less tolerant in my experience, but I haven't had as much experience with them. Of course they also tolerate quite low light, but they do not grow as fast. Perhaps that is a good thing, if there is a weed in the orchid kingdom, Ludisia discolor might be it.
To make a specimen plant of either species, break off pieces of the 'vine' as they get too long, and stick the broken end right back into the pot. No need for rooting hormone. Breaking seems to work better than cutting, for some reason. Keep doing that until you can't stand it any longer... When you make a break you will induce branching (a little) in the original stem. Otherwise the stems get very long and will break on their own, so you might as well control the process.
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good info. littlefrog .I killed my Macodes repotted it in Pro Mix stayed to wet and compacted 
. Gin
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