The CB dart frogs are not toxic. You will put them in a habitat that that is more or less self-sustaining and biologically balanced with plants and the substrate. Plants and soil organisms live off frog poop and it gets recycled. Once a year or so you will want to manage your broken down substrate by either adding or replacing some of it, but other than that, all you do is feed the frogs, manage the plants, mist, and clean the glass when it needs it. You are not obliged to continutally "change their diapers" as one must do with most other amphibians and herps. Read the care sheets from the various sponsors and people on the forum. There is a lot of information about setting up your tank, including water features, lighting for the plants, ways of maintaining humidity and rain forest misting. You can go as simple or as fancy as you like. With the right temperatures and humidity, your frogs will survive and prosper in a terrarium situation with a minimum of disturbance. I think the dart frogs are the easiest to care for in spite of a reputation from the past of being "difficult." The leuks are among the most adaptable of all, and are delighful clowns with a decided ambition to eat every moving insect in sight.
Captive bred dart frogs are in fact much less toxic than many commonly kept toads and frogs that may contaminate their own water bowls and require continual cleaning an maintenance.
Take your time. Read everything and build your basic vivarium/terrarium. It can be either high tech and automated or very simple requiring hand misting and sumping excess water with a turkey baster. Both ways work. My own vivariums are somewhat in between.
The frogs are in more danger from you if you handle them than you are from them.
The photo is the center section of a 72 gallon bow tank that now contains my own D. leukomelas. There is a water fall on the left and a gentle stream on the right, both pumped from the shallow pool. The leuks like to play and hunt in the water, that is now more shallow from adding more large smooth stones, but they also sleep up in the bromeliad leaves. I trim plants, feed the frogs, mist the plants and frogs with a hand sprayer, add water to the pool on occasion and and siphon out the excess from the drainage layer. That's it. It is a mini-environment that largely takes care of itself. You don't even need a water feature. I just like them and so do the leuks and my galacs. Arboreal frogs will ignore water features, preferring the water in the bromeliad leaves.

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Patty
Lost River, Idaho
4 D. auratus blue
3 D. galactonotus pumpkin orange splash back
5 D. imitator
4 D. leukomelas
4 D. pumilio Bastimentos