Hello everyone~ I went to a flea market that my school was hosting yesterday and got my first two oncidiums for only 7 dollars! But my big question is should I repot them? The mix they are in looks a bit too fine so I'm worried about air circulation and the chance of root rot.

Here's a picture of the potting medium:

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They are both currently in bloom right now so I'm a bit apprehensive about changing them and they seem to both have healthy root systems (at least on the outside of the root ball) but what do you guys think? Any tips are appreciated for a noob like me~