The media is medium grade (1/2 to 1 inch) Fir Bark, about 75%, some medium grade charcol, coarse sponge rock or perlite & a little crushed oyster shell. I found they really do not want the mix to go dry at all. So I water them more often than I would a Paph rothschildianum, usually once every 3 or 4 days. They are in the direct path of one of my small fans, so the air movement is good, so they are in a medium coarse mix with lots of air spaces & they are grown wet, about 36 inches below a 400 watt HPS lamp. Temperatures are intermediate, coldest is 58 F at night in winter.
Justin, your seedlings will pick up size fast, once they reach about a 12 inch leaf span. Think about whether you are keeping them moist enough, maybe shorten your interval between watering by a day. I also fertilize every time I water, using 1/2 teaspoon per gallon of MSU Orchid Special formula. That's pretty dilute, but I do it every time I water. It should only be two to four years and the seedling(s) you got from me should be up to blooming size. Remember, the one above is at least 6 years from flask, maybe even a year or two older, I did not keep detailed notes.