You can also just pick them off when you see them and put up with a bit of foliage damage. If you ignore them and have a living vivarium, their population will stabilize to just a few now and then. A lot of people are doing this now and finding that it is worth the patience, since the other scenarios, such as Co2 (dry ice) kills many beneficial organisms essential to the balance, as well as slugs, and then, doesn't kill off the slug's eggs. Try just picking off the more obnoxious and obvious ones and putting up with some plant damage. After a first bloom of them, they will gradually decline upon their own and just become a rather minor part of the overall life in a vivarium. (Believe it or not, this does work, but takes patience. I'm rather a slug hater myself, so have tried it all.)
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Patty
Pahsimeroi, Idaho

D. auratus blue, auratus Ancon Hill, galactonotus orange, galactonotus yellow, fantasticus, reticulatus, imitator, castaneoticus, azureus, pumilio Bastimentos. P. lugubris, vittatus, terribilis mint green, terribilis orange.