When to remove a dying leaf?
 

This may be a simple answer, but I'd like to know if I should just remove a slightly yellowing leaf. There are two other healthy green leaves and a new one on its way.

Just wait for it to fall off. When they are dying the orchid is using up all the energy left in the leaf as it dies. Once its all done, the leaf will come off with a gentle tug.

Thanks Josh!