I think Falconblade has answered your questions as succinctly as possible. I would encourage you to do your own fruit fly cultures, however. You never want to run out while waiting for an order, and it is indeed much less expensive. If you don't live in a very cold area where fly shipments might get too cold in transport--or too hot in summer, for that matter, there are places that will set up regular shipments for you. I believe Patrick Nabors at Saurian will do this. Although for most of us, fruit flies are the mainstay, you will want to vary the diet with pinhead crickets, available on line, springtails (you can get a starter kit from Ed's fly meat), and some people like rice beetle larvae. Field plankton, or meadow plankton that you net yourself during the warm season is also a nice addition, as long as you can be assured that you get it from an area uncontaiminated by pesticides.
As stated, arboreal is a relative term, especially in a small hobby set up. (In a rainforest, the difference between terrestrial and arboreal is many meters, while in a hobby tank, it is only a matter of inches.) In general, the thumbnails prefer to hang out and breed among bromeliads and the higher parts of a tank, but can be seen hunting (or fighting) on the ground, while the others are found more often on the ground. However, my galacs and leukomelas all like to climb up into the upper branches and sleep in the bromeliad axils.
Just read everything you can--all the care sheets, and get advice from the breeder you chose to purchase your frogs from.
Your set up does not have to be high tech. Simple set ups that keep up the required high humidity and the right temperatures will work very well. Darts are not all that difficult to keep. I think they are actually easier than most other kinds of frogs, which seem to require higher sanitary maintenance than frogs in a terrarium environment with a modicum of biological balance among plants, soil and the critters that help break down the frog feces.
My own opinion about the ultrasonic foggers is they suck, although while they last, the fog is interesting to watch. I personally just mist by hand with a hand sprayer. I did put in a humidifier called Tropic-aire in one tank. I really like this because it is extremely simple-- just air from a fish tank air pump that first bubbles through a water reservoir, and then goes into the tank via an airline hose and small distribution pipe. It's relatively cheap and except for replacing water in the reservoir, is maintenance-free.
Welcome to this hobby. It is a rewarding one, and very addictive.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
3 D. galactonotus pumpkin orange splash back
5 D. imitator
4 D. leukomelas
4 D. pumilio Bastimentos
4 D. fantasticus pending
