The only problem (that I know of) is with certain frog species, especially PDFs and FBTs. All frogs are toxic to an extent, but PDFs and FBTs moreso. PDFs can usually be kept together if they're from the same region and the tank is large enough, but FBTs really shouldn't be kept with anything. I mean, if you have a well planted 100gal tank and 2 FBTs and a tree dwelling gecko, you'll probably be ok. The plants tend to soak up a lot of the bombesin (FBT toxin).
RETFs stress easily, BUT if you meet their condition exactly and add another ground dwelling species with the same requirements in a spacious tank, then you will MOST likely be ok.
The obvious is for a mixed species tank you need extra room. If you can keep 4 of species A in a 100gal tank, you should have a 150gal to house 2 of species A and 2 of species B of similar size.
Personally, I'm not a fan of mixing species. I think it's ugly and the way some people haphazardly do it, downright inhumane. I like to have multiple tanks, each one focusing on 1 particular species. But, at the same time I realize other's desires, and do my best to help those who have their heart set on mixed tanks....especially those who are smart and seek advice first before doing it!!
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HAVE:
0.0.4 Bombina Orientalis ; Fire Belly Toad
0.0.3 Bombina Orientalis (Bronze) ; Fire Belly Toad
1.0.0 Canis Familiaris ; Golden Retriever
WANT:
2.2.0 Agalychnis Callidryas ; Red-Eyed Tree Frog
4.4.0 Dendrobates Azureus ; Blue Poison-Arrow Frog
4.4.0 Dendrobates Leucomelas ; Bumble Bee Poison-Arrow Frog
4.4.0 Dendrobates Auratus ; Costa Rican Green & Black Frog
Hippy, Happy, Hoppy, Hopeless, Horace, Hank, Harvey....and Takoda
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