I would like to say if you're going to add fish, it would have to be very resilient ones. Firebelly toads secrete a toxin which can build up in the water. It is not recommended to add gold fish or other pond like fish due to their history of carrying parasites. They also produce a lot of waste.
Mixing frog species is never recommended. They secrete different toxins based on their species. This is to protect them in the wild. Our enclosures are much smaller than in their natural habitats where they can move to another location if feeling threatened or at risk. This is not possible in terrariums and vivariums. Toxin exposure over time even in small amounts and stresses may occur, leading to further illness, cessation of eating, territorial issues of both terrarium areas and food, and sometimes death may occur. It's never really worth it in the long run.
If desiring more than one species I would recommend adding another tank.





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but i keept it with feeded gold fish(bout 1inch and 15cents each) and i keept it with chinese fire belly newts witch are nativly found together and live well together
