Cheers guys.
Just to reiterate the point about leaf litter - not only does it provide great place for springs and isopods I have also found it can help increase boldness in shy frogs (particularly thumbnails). I use a mixture of oak leaves, which break down relatively quickly, as well as dried magnolia leaves which last a very long time and are very popular with springtails. Tropical seed pods also great - I use almond pods, savu pods and sapucuja shells