Fire belly toads and other frogs???

[mpmistr]

Really lol. But surely fish will die as well because theyre always in the water

Nah, fish work. If you do partial water changes every week and have enough water volume the fish will be fine. I don't think FBT are so toxic they would cause much of an issue.

[Fbt123]

I think it will be ok, but if anything goes wrong, ill remove it straight away. If i clean the water every few days it should be fine, besides i will mist the tree frog bit so it can get water from there. I could even put one of those seed things you can get that looks like a coconut and ill put water in that for the tree frog