Not just too small for that many frogs, but you can't keep multiple species of frogs in the same vivarium. All frogs are toxic to each other, no matter how serious. It is never ever a good idea to house different species together, I would recommend separating them as soon as possible. I'm sure that these two issues are what is causing your frog stress. I have 3 white's, and they are only kept with themselves. Plus, I believe the false tomato frog has different care requirements than the tree frogs. I have never kept a false tomato before, so I can't accurately comment on that. Lot's of people make the mistake of multi-species enclosures, but it eventually kills both frogs if left that way. I would keep no more than 3 white's in that size enclosure. Hope this helps, Dalton.