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It looks like if it ain't broke don't fix it. With orchids there is more to it. How are the aerial roots helping the plant, are they harvesting moisture and nutrient and passing it on, probably not unless it is hanging outside and getting rain and foliar feeding. Also remember orchid roots will live if they grow into water but rot if you place established aerial roots into water. I suggest a very open mix, lots of leca or pumice and perhaps 35% bark. Placing air roots into wet medium does not work so expect root death. It is always better when new roots looking for moisture naturally penetrate down into the media. In your case the new roots had no where to go. When I see plant roots not going into the media and becoming aerial, it is because the plants do not regard the media as a good source of moisture or nutrient harvest, that is an observation lesson. Pic shows cattleya roots immediately heading into the media hunting for stability, moisture and nutrient. Note the open mix. Cheers. Good luck.