I have a 10 gallon aquarium that I converted into a vertical terrarium with a hinged door. I keep smaller height Masdevallia and keep them in small pots (divide annually). I am easily able to get about 10 plants in it. Any more and the plants are too crowded. Plants are hanging on suction cups and also at the bottom on a stepped eggcrate bench. I have a small computer fan running constantly and the humidity stays around 70%. Humidity is higher if I remember to top it up with standing water under the plants. A 10 gallon aquarium is 10" x 12" x 20". I wouldn't go any smaller for Masdevallia. You can likely go smaller for Lepanthes, but I don't have experience with them.
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