I started out with dart frogs about eight years ago, amd had the kutzpah to put the first ones in a 135 gallon paludarium with a section for tropical fish. The original frogs are still alive, and so are most of the original tropical fish I always failed with in the past. If you just read up and follow the basics of temperature, humidity and feeding, they are easy to keep. I have about 12 different tanks of varying sizes and shapes and plantings now, all low maintenance, because they are biologically recycling. Frog losses have been low, and losses have been mostly due to my own stupidity about how easily they can escape through tiny cracks and turn into mummies on the floor in no time.
I tend to think that dart frogs in general, although not all of them, are a great way to start out. A pair of D. tinctorius or azureus, a group of leucomelas, galactonotus, or any of the auratus morphs, P. terribilis, are happy campers with a planted environment, the proper humidity, and some vitamin dusted fruit flies. There are some that may be a bit more demanding, or actually intimidating. Some species are more territorial than others, so need to be kept in mated pairs for the best results. Then there are the groupies, such as the leucomelas, glactonotus, P. terribilis, and even the thumbnail imitators, that do well with a bunch of them together.
If you do your homework, build a tank that has the proper temperatures and humidity, (65 to 80 degrees and above 80% humidity most of the time), plant it with live, small tropical plants to recycle the wastes, either have a false bottom and a waterway, or simply a drainage area of gravel under the substrate, and culture a lot of fruit flies to feed them, dusted with calcium and vitamins, the darts will prosper.

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Patty
Pahsimeroi, Idaho
4 D. auratus blue
6 D. galactonotus pumpkin orange splash back
7 D. imitator
6 D. leucomelas
5 D. pumilio Bastimentos
4 D. fantasticus
6 P. terribilis mint and organe
4 D. reticulatus
4 D. castaneoticus
2 D. azureus
4 P vittatus
2 P. lugubris