I have several cymbidiums as well with more then several spots like this. I will admit, when I first got my cymbidiums, I thought they were doomed....but it turns out there was really nothing to worry about....I have leaves that turn yellow....and the cyms just keep on growing! I have to say, my cymbidiums are the most care free plants I have, or at least the one's I worry least about...not sure why that is but it is nice! Now to see how they will do in an orchidarium, I am not sure if I will be able to keep them in there since they need a good temperature drop in the fall, but I can always put them outside in the fall if needed, summers are just to hot! Okay, I am done rambling on now