I haven't grown this species. My general approach is to recognize plants in habitat are highly resistant to pathogens, otherwise they would go extinct.
I also know of many species of plants, from many families, that were considered almost impossible to grow until various things were learned about their requirements.
Blackening of leaves does not always mean fungal attack. Blackening leaves develop on Cattleyas when they get sunburn, when new shoots don't get enough water, and when new shoots don't get enough calcium. Other Angraecums I've grown had leaves turn black when they were falling off due to age.
I'm not convinced your plant had a fungal attack, especially since you haven't reported seeing fuzzy hyphae, nor fruiting bodies forming on the leaves. Treating prophylactically with fungicide is not a remedy for something lacking in the growing conditions, even moreso if you aren't sure you have a fungal problem. If plants are considered to routinely develop fungal issues, that means to me we haven't figured out what they want in terms of growing conditions, because healthy plants aren't much susceptible to fungus when conditions are good.
I haven't seen this plant in habitat. I would want to know how often it dries out completely during the growing season, both roots and vegetative parts. I would want to know how much direct sun it gets, if any. I would want to know how humid it is in the growing season.
I would call Hausermann's and talk to their growers. They are very happy to talk at length to customers about how they grow plants.
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