I know it's frowned upon to mix dart frog morphs, such as tinc Azureus with tinc Cobalt, for fear of creating hybrids that may get mixed into the hobby labeled as pure morphs.

But what about Phyllobates terribilis? The three "morphs:" mint, yellow, and orange; can they be kept together?

On a side note, what's the best way to NOT end up with babies with dart frogs? Obviously have two mes or two females, but if you end up with a pair, what do you do?