That Brassavola cucullata can and should be thoroughly watered daily, every 2 days at the very least. You can't overwater a mounted orchid like that. It may be reacting to lack of water - if it is insufficient, it will drop leaves to cut down on water loss through transpiration. The Den. thrysiflorum won't do much of anything until spring, except maybe for dropping some leaves (it may or may not, but definitely this is getting to be nap time not grow time. You should not totally stop watering, but you can cut back. Fertilizer is the the least important factor - the Den should not get any until new growth starts, the others will eat less as the weather cools and days shorten.
Also, orchids don't do anything fast... 1-2 months is nothing in the growth cycle of an orchid.
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