Just make sure you get one of the larger species of poison darts. The tiniest species tend to be prone to issues! The big ones still do fine in a ten gallon. The biggest issue with them is handling(their small bodies mean they take on toxins in our skin easily) and food (getting small food)
Now, make sure you maintain humidity for them (cover most of the lid with aluminum foil, plastic, etc.) and use digital temp and humidity readers.
I'm not too sure on heat requirements of darts(I know they like semi warm temps but not hot), but if you do need to use a heat pad of some sort, make sure it's NOT on the bottom. Frogs escape heat by digging down--so if they are overheating, they can really hurt themselves by digging closer to the heat source. Put it against the side. Also make sure it is removable! Heat pads are 'sticky' and can break if you try to remove them from the glass(there are ways, but it's tough, and you dont' want to struggle if your frog is overheating). I like to attach a heat pad to a separate piece of glass or something that can be lifted away and taken from the tank if needed! :) You can also reuse the heat pad if you need it on another tank. But if you have a warm enough room, this is all unnecessary.
When you need to remove him( cleaning cage, etc.) cup him in a deli cup. Try not to use your hands, BUT soak your hands in water anyway---Treat him like a fish, soap is toxic to them too!
Honestly having a poison dart frog is a lot like having a beta. Clean the cage weekly, change out substrate monthly(or so, maybe less often depending on how dirty it gets), and then feed it the right food. You can't really 'hold' either of them, so that's not much different either. They all make fun noises too if you get a male!