Welcome to the forum .

The safest way to avoid stress on the frogs is to choose frogs with different markings, but the same species. Mixing can cause stress, territorial issues, lack of feeding by the less dominant, and illness due to the stress. Many carry levels of secretions or toxins that could long term affect the other species, also.

But, if you end up loving them like we all do, making two vivariums is even more fun than one .