The frogs are now about full-grown. Some of them are incredibly fat, like odd-coloured ping-pong balls. We've identified them as Southern Brown Tree Frogs (Littoria Ewingii), very common and not needing a licence to be kept in Victoria. http://frogs.org.au/frogs/frog.php?frog_id=3
About once a week we trawl through the frogbox, sifting leaf-litter and looking under their bits of bark. We catch them and give them a swim. It's not clear whether they enjoy this but at least it livens up their day.
We remove any dead crickets or mouldy stuff, refill the swimming tray with clean water and reassemble the habitat.
If it's sunny we watch them swim and kick and climb and we chase any that get out of the swimming box (usually a lot. At the same time. In as many directions as possible.). Then they go back in their frogbox with fresh crickets to hunt.
However the census has been dropping. It hit a high of 31, then dropped to 20, and this week we had only 15. Evidently they haven't read the Act and are releasing themselves into the wild. These days we keep their box on the front porch.