I am usually the last person to suggest more air movement as it is too often suggested as the cure all to most problems however in this case there has been too little air movement - however I will not leave it at just that.
Orchids need a bit of heat during the day too and I know if you had been heating that orchid it would not have developed that much mould - regardless of ventilation so that should be your next step to address which will benefit the orchid too.
mould generally likes cold damp conditions, orchids generally like warm humid conditions.
All the suggestions so far have been good so the last thing to realize is that mould does not usually grow on orchids - it grows on something decaying. Your fridge is over 90% humidity most of the time yet things in there only start molding if they start to decay. The aim is not to dry out the fridge by adding ventilation - the aim is to throw out the moldy onion or whatever - same principle here which is why I like inorganic media like seramis, clay pebbles and perlite so much as they can't rot or mold.
Replace your media - yours is past it's use by date. Coco coir is not a good medium for phalaenopsis anyway.
Most go with bark which if good quality will last 2-3 years.
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