Just to be contrary, I'll pipe in with the observation that sometimes orchids will adapt to wet stagnant conditions. In my classroom I have some noid minidens that have rooted in wet [no not moist -- wet] peatmoss. One of them bloomed this past winter.
The tank is a 10 gal and is sealed with plastic wrap. [I generally find I can go a year without watering it.] There is no fan. The plants have been in there for at least 5 years now. Had a pic but can't seem to find it now.
So the upshot is that while it is possible, it isn't necessarily likely. Safest route is to provide air circulation and don't keep the media too wet.
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