Do different toad species just get along? Or can it only be certain toads that are kept together?
Many toads can be safely and happily kept with members of their own species provided the two are similar in size. [The keyword is “many” though, there are species of frogs that absolutely must be kept alone, such as pac mans.] Toads will attempt to eat anything smaller than them that moves and have been found to eat baby toads, so they have to be close to equal in size.
Its generally agreed in the hobby that most frogs should be kept only with members of their own species, to prevent the accidental spread of disease or parasites. Its possible some frogs could be carriers to a disease they’re resistant to and asymptomatic when they pass the disease on to a less-protected cage mate of a different species.
However I have wondered for some time if some species of toads are similar enough that they could be kept as cage mates, ex. American toads and Fowler’s toads, but I’m not looking to attempt any cross-species enclosures right now or really ever, it’s mostly something I’ve been curious about.