Den. Lorrie Mortimer Help

[estación seca]

The photos are a little fuzzy, but I can see it hasn't had enough water. The moss is dry. It may have spider mites.

The antelope group Dens should not dry out. They like to be evenly moist and warm all year, with bright light. Seedling Dens are even less tolerant of drying out. If you've been letting it dry between waterings that could be part of the problem.

If there are dying patches on the leaves you probably have spider mites. I would spray the entire plant and medium surface with one of two things: Either a dilute liquid dish soap solution, about 1/2-1 tsp per quart; or, 70% isopropyl rubbing alcohol. Repeat this every 4-5 days for 3-4 treatments. Do some more reading here on Orchid Board on spider mites.

Are you fertilizing? Sphagnum has no nutrients. It won't grow without fertilizer. Any fertilizer with the three numbers close to each other could be used, at half the dose recommended on the label.