I would say with a much larger tank (100 gallons or so) you could mix them if you have appropriate temperature ranges. There are not many WC frogs in the hobby right now, so unless you have some of the Panamanian D. auratus that came in recently, you should not have much of a problem. The problem with P. ornata is they are very skittish and do get to a good size. I would be worried about dart frogs near my adult male. I've kept P. quadriocellata with E. tricolor and D. tinctorius over a decade ago with no problems. This was in a tank that was 4'x4'x4', so pretty big. A friend had P. laticauda angularis in a tank with one lone E. tricolor and after two or three years of cohabitation found his E. tricolor in the mouth of his male gecko. I really would mix only P. klemmeri with any of the dart frogs, and definitely only larger sized ones.
Best,
Justin

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