Re: Frog decision
Some people believe that keeping animals in captivity automatically negates any potential of observing normal behaviors. But I 'believe' that is a short sighted ideology.
As we develop our practices there is opportunity to create vivarium-as-lens. There are behaviors, especially of small and cryptic taxa that viewing on an intimate continuum is enabled in a way that can surpass field work.
But if you are adding other living species in close proxy you can never have a clear site. There will always be a very dynamic feature of unnaturalness. It must be included in everything you might see.
Right down to basics, like frogs eating fruitflies that are regularly walking on the urates deposited by a booming group of little geckos.
"Its okay, its probably not a problem" is one way to look at it.
The closer you watch your animals the more you actually want to know what you are seeing, you can never see them clearly if you only see what you want.