Get a lot of experience with individual species and their separate personalities before you consider mixing different species of darts. I wouldn't personally consider auratus and leucomelas as being very compatible. The leucs are generally more bold than most auratus, and would be likely to intimidate them. Enjoy and watch those you already have now in separate vivariums. Leucs are sexed much like the auratus and many others, by body habitus, the females being a bit fatter and larger, and the males having a more slender appearance. This is not always apparent with well fed, or over-fed frogs. Leucs are pigs and tend to get fat in captivity. As most others, except for P. terribilis, it is only the males that call. So calling indicates a male. The lack of calling however, is not an indication that the frogs are female. So like most others, it's an "iffy" somewhat arbitrary call on your part to distinguish them.

As Otis7 pointed out, don't rush into a lot of different species before you learn something about the ones you already have, and have some success with accommodating each separately.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)

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