Hello,

Welcome to Frog Forum !

It's best to never mix species. The different species should be separated. The same species/ big size differences need to be separated as well as this can cause lots of problems. This becomes even more important when , or if, the frogs are wild caught? You risk cross contamination w/ illness, toxicity, and parasites. Sorry

When in close quarters, cannibalism can occur depending on the species. You need to consider the aggressiveness of one frog vs another. Some frogs, who might be more territorial than others can end up bulling the other more docile ones. This causes a tremendous amount of stress. A docile one might even die.

Review of common problems :
-are cage size needs
-conflicting environments ie temps, humidity , land , water
-cannibalism - it's amazing what a frog can fit in it's mouth
-toxicity
-dietary differences

Keeping mixed species is for the very experts in the field! ie zoos
It takes an enormous amount of research, time, space and lots of money.

Lynn