My Drendrobium is of Phalaenopsis type. When it came from the shop it was bloomed and having healthy deep green leaves from bottom to top as well as three keikis. After more than a week without problems, it started loosing the leaves of the keikis and after that, one, by one the inferior leaves of the main plant. They start getting progresively yelow and after a few days, they are done, step by step as if the yellow is ascending the stairs. I would say that light conditions of my room are ok. The humidity is from 60 to 73%. The temperature from 55 some nights to 75. I have a several orchids in the same room that do not show any problem (1 Phal, 1 Vanda, 2 Oncidiums, 1 Cymbidium, 1 Miltonia and and 1 Cambria.).

I don't know what is going wrong with the Dendrobium, and if that leave dropping will end. ¿any ideas?