Hi Milui,
Al and Sue are right, you can go just about any direction you want so a little digging here will give you an idea of what's possible. There are a few considerations for any tank of any size and style.
Light, of course, is a hot topic (pun intended). There is a ton to learn and I'm no expert, but this is a pretty essential part of the puzzle. Common aquarium hoods usually don't provide enough light to grow some orchids. Look around in the "under lights" forum too.
Air movement is crucial and often overlooked. Just about everyone who has a successful tank setup has 24/7 air movement inside the tank via a small fan. Mine is a tiny little cooling fan from a decommissioned PC, but you can get creative.
That's about as far as I got - no fish, no gravel, just packed full of orchids. Mine is just a 10 gallon tank with a piece of plexiglass on top (1" gap) and a T8 Shop light resting on top. Very low-tech but its a great place to establish seedlings, picky transplants, and the one or two cooler growers I have.
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