Alvin, thanks for you comments,
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Allen, I don't think it's easy to get perlite at local nurseries. I have yet to find one that sells perlite. Ace hardware sells a bag of perlite for about RM8-10, I think so.
Over this weekend, I am going to attempt an extremely complex media that I bet not many people have tried yet. I'm trying to imagine how northiana's habitat would be like, and to mimic it.