Welcome to the forums. I have researched these toads also as i have recently saved three from being set free in a lake....and I think we are reading the same sites lol. From what ive read 10 gallon is big enough for a pair of FBT's. 70-30 water to land is also what alot of sites ive read suggests. rep filters are also best according to sites.. I do agree with the salmonella concerns but a reptile screen cover that has padlock will keep childrens hands out of the tank. One thing to warn you about....they are addicting and you will prob end up with a bigger tank and more frogs lol..at least thats what im doing anyway lol. I also have reptiles and can tell you most places dont have geckos,skinks and dragons for under 30 bucks...which is the cheapest ive sen darts for...and none of which id suggest for a three year old for the fact that geckos and dragons are fast...little hands trying to reach for them will pull a tail off in a hurry and skinks have a nasty bite...second all reptiles can carry salmonella so what ever way you go id still suggest the locking screen top..just my two cents worth. good luck with the setup.