Den unicum is deciduous and, if the one I used to have is a good judge of the rest, spends most of the time looking like a pile of dead twigs. If you just imported the plants from the other side of the world, the change in light/temperature it's now getting could be telling your plant that its time to go to sleep. Don't give up on them yet.
Unfortunately, I've never deflasked a plant before, so I can't really tell you if it should be done right away or if you should wait to see if they'll perk up again.
Tyler
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dlkc 
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