I have the same temperatures (perhaps lower), same orchid, same vendor, bought just a little earlier in the winter. Mine is growing in a north-west window under a T5HO light and, as I kill roots very effectively in bark, I transplanted it into red lava rock/ basket pot right away. I added Osmocote and eggshells.
Charles, you should soon see eyes developing on the pseudobulbs. Once you have new pseudobulbs a few inches in length, you can think about transplanting the orchid in a way that is more suitable for your conditions. If you are having trouble watering in bark, you may want to choose a different medium and a pot which allows you to see the roots. If you don't mind watering every day, you could even put the orchid in a large clay pot with a few large pieces of brick/stone/shards to stabilize the orchid. In cooler conditions, using a medium that stays open and allows plenty of air to the roots is vital as you need healthy roots to sustain a Cattleya through the winter.
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