Thanks guys for the advice.
I learned that Den canaliculatum (at least the one from Papua) likes their roots to be completely dry between watering. Hence, they are mounted straight to bark with no moss or coconut husk or whatsoever to retain water, unlike other dens.
Under the situation of heavy and continuous downpour which is very common during rainy season in here, they are very prone to rot. I might have to put them under canopy where they will be covered from continuous shower.
I will take your advise on potting medium for Den speciosum but if grown from seedlings, they sure take a very long time for maturity. May rival those of Gram speciosum.
But I read that Den tetragonum likes a more moist and shaded condition. They can be grown hung on basket with sphag, while Den speciosum can be found living straight on rocks.
It's true that growing them in my area will likely never bloom. But at least if they can be grown happily, making it bloom is only the matter of time and techniques.
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