Capanemia uliginosa/superflua culture tips

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I've never grown it.

From reading the entry in the Internet Orchid Species Photo Encyclopedia, you may be giving far too much light. It is a full shade plant growing under the canopy of evergreen trees. Try it with Phalaenopsis level light.

Your days are probably cooler than it prefers, as well. When you read an orchid is cool to warm growing, that refers to night temperatures. Even in winter this part of Brasil has warm to hot day temperatures, easily 25-30 C / 77-85 F or more.