The leaf might have had sunburn. It is normal for most Dendrobiums to yellow and drop leaves off older canes. When mine do that I just pull it off.
As far as the chunk of coconut that it is in...You have a couple options. If you are not the type to over water you could just leave it alone, set the whole thing in a larger pot and fill in with a bark mix. If you have very humid conditions or tend to like to water a lot I would take it out of there because older coconut husk holds a LOT of water and tends to decay and eventually rot... you could soak it for a little while and then take your time to tease apart the block taking care to injure/lose as few roots as possible. I did this once and it took me awhile and a lot of patience, but it worked out alright in the end.
ME




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The benches are specially made for the orchids and now there is not enough sunlight to grow them.
What type of orchid would be okay? This area could also get so wet during rainy season. sniff sniff
