Do you have photos of the tanks you are wanting to work with Brett? Also do you plan on making this a breeding tank as well for the tree frogs? For whites I found these species to work splendid:

1.) Alocasia
2.) Pothos
3.) Monstera deliciosa

These are an all time favorite however its not that easy to get Alocasia to grow in pure ABG mix So I recomend an environmental and frog safe ferterilizer that was recomended to me by Carlos (MENTAT).
He may have the perfect mixture for what you will be looking for.

Seachem plant fertilizer