Filter and other stuff

[John]

Screened lid is the way to go - make sure it's made out of sturdy metal to prevent the cats getting in. In the US we can buy such lids at any pet shop but you might have to do some searching in NZ. One point - since Bell Frogs climb well, you need to make sure the lid is held down so they can't raise a corner and escape.

Filter-wise, undergravels aren't great for animals like frogs, but as for swallowing gravel, I don't think that's a significant issue for tree frogs of any kind (I include Bell Frogs in that group), provided it's not on the land part of the terrarium. I like the sound of the tall filter you describe - the water flow from the top should help keep humidity levels up.

Glad you like the site!