Most cym growers, once a plant is large enough for a 3" pot, use a blend of fir bark or Orchiata or Coco husk in different sizes to match the size of the pot. That is usually mixed with a 5-10% percentage of sponge rok (perlite). Some also use a small percentage of pea gravel, sphagnum moss, coir or charcoal.
Keep in mind that if you ask 10 different growers what they use, you will get at least 12 different answers! A lot depends on your climate and your watering habits. Hot and dry climate will need a more water retaining mix; hot and humid will need a mix that drains quickly. A temperate climate will be a mix of both.
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