There is no reason you cant increase ventilation a little bit. I have kept dart frogs where there was a computer fan exchanging vivarium air with the outside air during the night time hours. You just need to tweak the amount of time you keep the fans blowing. I too got into growing orchids when I started to building vivariums. I now have a vivarium that is now officially a terrarium (due to absence of animals), and its all orchids.
I keep three Phal species ( parishii, lobbii, deliciosa) and tow hybrids (lovely kid, and mini mark). I have found mini mark to be a little sensitive to rot in the vivarium though, even with ventiliation.
Bulbophyllums love it wet, hot and bright. I would research those. The problem is that just some of them get too big.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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