Phantasm pretty much covered it.
The plants are sterile inside the flask so there is no need for fungicide -- yet. Make sure any medium is new and clean. Also, some seedlings HATE getting misted. Not sure about this particular variety.
New guy, Orchid seeds are like dust. They are so small that there is little or no energy for a seed to "germinate" the way we normally would think. In nature germination is somewhat rare, but we can germinate most seed on a sterile gel, like a petri dish. The gel and plants are inside a clear glass vessel (flask) so the plants will have light. This gel grows fungi and mold really well, so everything including the seed, must be sterile!