I wouldn't personally start out with D. azureus, although they are beautiful, and not all that hard to keep. They are territorial and you'd need a relatively mature sexed pair, which is expensive. For a first dart frog experience, I would reommend D. leucomelas (do well in groups), P. terribilis (really take over and are fun and hardy,) and D. galactonotus, which are also good in groups, but a bit more pricey and less available. These are all relatively bold, so you will see them out and about a lot if you have a proper set up with the right temperatures and humidity. I love the thumbnails, and they aren't generally that difficult to keep, and are relatively bold, depending upon the species, but I'd still recommend just take your chances about pairs by getting four of the larger groupy dart froglets, at first. The only reason I wouldn't recommend D. auratus, is because all I have are the blue morphs, which are extremely shy-- I mean so shy, that even four years later, although they are all still alive, I seldom see them out and about. You want to show them off to friends on occasion and look at them yourself. Maybe the greens and other color morphs are less shy. You don't want to start out with a shy frog that you never see unless you dig it up or go on a search to count the ones that are hiding just to see that they are still alive. That's just not any fun. I have one particular blue auratus I named Larry, after Garrison Keillor's skit about his brother, who has lived in the cellar for 15 years and nobody ever missed him. Larry emerges annually, on both the Garrison Keillor show and my tank. When I put the auratus in a larger tank, he was still alive and well, but I had to dig around and search for him. Actually, Larry is a female, as are the other three. They have laid some eggs on occasion, which I understand they will sometimes do, even without a male, but of course, the eggs are not viable. Individual experiences aren't the entire answer, so get whatever frog you are most attracted by, then keep them and enjoy the show.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus