Dendrobium bigibbum is a species. It's likely your hybrid has bigibbum as a parent.
I have a mounted Den bigibbum (v compactum), a smaller variety, and a bigibbum hybrid that is potted. The mounted one does grow on the dry side even with daily watering. The potted hybrid I keep slightly moist moist of the year, but allow the media to dry in-between waterings in winter. Probably shouldn't be dry long while blooming.
Slightly cool in winter is ok, but they don't want to be very cool.
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