Vanda with fungus?

[Nicolasdperez]

I recently purchased two vandas a couple of months ago. One has grown several roots and even a flower spike; however the other one has barely pushed out roots. When observing it I noticed several black spots on both sides of its leaves. Around one of the spots, the leaves seem to be yellowing. I am new to growing vandas and I am unsure if this could be some sort of infection. All spots are seen in pictures . Thank you for your help