When you mix species in such a manner, you are bound to have New World Syndrome be a problem for you and your animals. Below is an excerpt from the following website:
http://www.livingunderworld.org/amph...rticle0007.htm
"The most common reason amphibians become ill in a mixed species environment is due to the introduction of foreign pathogens from species from different areas of the world. In the wild, species are exposed to numerous local pathogens, such as bacteria or virus strains, fungi, and other harmful agents, and through evolution have developed natural resistances/immunities to them. However, because these pathogens vary greatly from one location to another, the natural resistances developed by a species also varies greatly and is dependent on that species immediate habitat. Again, the case of European invasion and the effect of European pathogens on Native Americans can be referenced. For example, a newt from the United States, such as N. viridescens, will have developed resistances to different pathogens than a species from another environment, such as the Chinese Fire Belly newt, C. orientalis. A species will still carry the pathogens for which it has natural resistances to, so when one species is introduced to a foreign species, those pathogens and other harmful agents are inevitably being introduced to each species, which typically ends up in the illness or death of one or both due to their lack of natural resistances (i.e. New World Syndrome). Pet stores often house several salamander and newt, and sometimes frog, species in one tank, which gives pet buyers the idea that amphibians are community animals and coexist in a closed environment with other species. Unfortunately, these animals are often ill when purchased and die shortly after due to their mixed-species environment. It is true that some have mixed certain species with no ill effects for several years, but it is very risky doing so, and not the behavior of responsible keepers. "
Again, do a full reading of the article in the above link. It will save yourself and your amphibians tons of hassle (and will inevitably prevent them from dying quickly in your care).
Let's not forget also that Dart frogs are tropical animals, and most species prefer temperatures in the mid 70's. Newts generally do not thrive unless kept in the mid 60's, and many species will become stressed if kept above the high 60's for long.
Let us also not forget that many newt species can be incredibly aggressive, and will likely remove a leg or two from the dart frogs. Plus, the toxins naturally produced by the newts wil likely kill the darts over time.
Read the article in this next link below in species mixing disasters:
http://www.caudata.org/cc/articles/M...isasters.shtml
Species mixing by the novice (As well as many zoos and professonals) almost always ends in disaster. Any other keeers who tell you they have done it "successfully" have either been EXTREMELY lucky, or have not had the tank running for long. Anything under 4-5 years is not long to me. There was one zoological institute that kept eyelash vipers and dart frogs together for NINE YEARS! However, after this nine years, the vipers suddenly decided to begin eatng the dart frogs. Therefore a few months is not long to deem a mixed tank as successful.
Nobody has ever convinced me that the animals will benefit from a mixed tank. There is really no good reason for it.
Stick to one species per tank. You will have a much more rewarding experience!
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