A 10 degree F / 4.5c temperature variance is nice but not necessary. Most will do well with a smaller variance. Lots of people don't worry about it at all and their plants do well.
It doesn't matter how the Epi gets wet, just that it does. I'm more worried about it right now when you need to hand water.
As long as the Tolumnia becomes completely dry between waterings it should be OK. Once a day watering in high humidity is fine. I have them go more days between waterings when temperatures are cooler and humidity is high. In the Caribbean, where they originate, there may be many dry weeks in the winter, though humidity remains high. But if the roots never dry to white there will probably be trouble. I would put it closest to the fan.
I've never grown a Neo in a terrarium. They come from a warm to hot summer monsoon climate with a very cool, drier and brighter winter (because the deciduous trees on which Neos grow drop their leaves.) Mine grow in a sunroom that is much cooler at night in winter than in summer, but gets quite warm most winter days. I'll leave it to the Neo experts about how they grow being at relatively the same temperature and getting about the same water all year long. My first thought is it would be easier to grow next to the Laeliocatanthe on the windowsill.
The Bulbo will grow so long as it's wet. The higher the temperatures the better it will grow. But the Pleuro. tribulus doesn't like being hot.
If it's warm enough for any of the plants to grow, those will do better with fertilizer. It's not a big deal the way it is with planted tanks. Most orchids do well with small amounts of fertilizer on a regular basis during their growing season. Some do better with more than others. Most cloud forest species, like your Pleuro, should have more dilute fertilizer than the others.
Do some reading about fertilizing orchids in the extensive Free Information section at the First Rays Web site. The proprietor posts here with username Ray.
Also - how far north do you live? A lot of people north of about 35 -40 degrees have trouble flowering Cattleyas without supplemental winter light on the windowsill. Your plant isn't flowering size yet so there's plenty of time to think about this.
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