Azureus vs. tincs
I'm one of those people that thinks D. azureus is more of a subspecies (geographically isolated population) of D. tinctorius, but for some political reasons they are kept a seperate species. Their care and breeding is identical. There are morphs of D. tinc ('kutari river', 'new river' and blue sips to a degree) that are extremely similar to azureus, and as froglets its very very hard to tell them apart. Its more along the lines of what color do you like better, and size (there are dwarf morphs of tincs like oyapok, nikita, lorenzo up to GO, reginas, and citronellas to 3 inches which are bigger than azureus which is about mid/normal sized tinc).
As froglets, keep them in smaller tanks. Too many females together in a tank is more of a limiting size factor than frogs in general, as its the girls that fight all the time in the tinc group.