All good points I hadn't thought about wanting to do a long exposure for a waterfall.
I'm trying to keep my pointers specifically related to frogs and frog tanks, otherwise this thread would turn into a novel
That's why my example was from a vivarium .
Outdoor frog photography does happen around here too and a fill flash can be a dandy thing, so don't neglect those who like to get their feet wet photographing frogs (and not because of a leaky tank!).