I agree with Coogan.
P terribilis are very bold. Wonderful species . The orange are magnificent ! They do, indeed need space!

Phyllobates terribilis 'Orange' - Phyllobates terribilis | Josh's Frogs

Also, think about D leucomelas. A VERY reasonable buy too! The will climb a little ( they think they are good at it ) but they are clumsy.
The are curious, will even dig a little. ---- so you will want to be sure all ares leading to pipes, backgrounds etc are secure. Pack the soil in real tight.
They are bold as well, busy, entertaining !, a few morphs to pick from, breed easily , like terribilis >can be kept in a group.

D tictourous will happier kept in sexed pairs. If you should get a trio--- simply provide plenty of cover and keep a eye out for any aggression or stress from a more dominant tank mate as they mature.
Dendrobates tinctorius for Sale | Poison Dart Frogs for Sale | Josh's Frogs


The best buy , by far is the standard D leucomelas.
Dendrobates leucomelas - Dendrobates leucomelas | Josh's Frogs
Dendrobates leucomelas 'Banded' - Dendrobates leucomelas | Josh's Frogs these are beautiful


D Auratus can be kept in groups---- however they tend to be SHY---- mine are anyway !
Dendrobates auratus for Sale | Poison Dart Frogs for Sale | Josh's Frogs


BTW Welcome to Frog Forum
Enjoy your 'find' ---- fun !