Yes, it is true. Some people will say it can be done, but the overwhelming majority of dart frog keepers/breeders will agree that it is a bad idea to mix different species in one tank.
The number one reason that you shouldn't keep different species of darts together is that the frogs will become stressed, which can lead rather quickly to death.
It can often be difficult to recognize the signs of stess in PDFs until it is too late and you start finding them dead in the tank.
You also should not mix different morphs of the same species together.
For example, the blue and black D. auratus and the green and black D. auratus should not be mixed together.
This is because since they are the same species they can breed and create viable offspring. That would create a hybrid, and which we do not want in the hobby. We want to keep the integrity of the unique locales and morphs, so we don't want to get them all mixed up.
I know a lot of people who are first getting interested in dart frogs think it would be really cool to have one of each color all in a tank together (I know I did!).
But once you do some more research on it you will realize that even though it might look cool to mix them, you should always do what's best for the frogs - and that's housing them with their own species and morph.
Check out Dendroboard.com
It is very informative and helpful - and you will learn everything you need to know about dart frogs.
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