Quote Originally Posted by flybyferns View Post
You might consider removing the tree fern completely. ( actually, it could scratch their faces )
If you want a dark background, you could paint the glass on the outside? This way you can keep the in glass clean on the inside.
Just think how contaminated the tree fern will be after the frogs have peed on it a few times!! This is exactly how frogs get sick!

You could feed the crickets on the substrate AND in a clear class bowl w/ about a 3" side.
-clear so the frogs can see the crickets through the bowl
-3" so the crickets can not climb out

After they learn to use the bowl you will not longer have to feed on the substrate.
They will get hang of the bowl very quickly. However, be sure you see them on/in the bowl before you discontinue feeding on the substrate.

Thanks for the info. I read that tree fern is a good "substrate" for mosses and such and with enough light it would be covered within a couple of months. For the White's, I have a Exo Terra styrofoam background in there, the tree fern is on the sides near the bottom. For the green tree frogs, I have a Zoo Med cork background -- is that safe? They like to sleep on top of it.

A feeding bowl does sound good, but wouldn't the crickets jump out of the bowl?