Tank humidity help

[irThumper]

Can't say with the humidity other than you either need more ventilation or a different gauge, but if the fan is working then maybe you've solved that problem?

I'd edited my above post to include this ^^

[Crispy42]

What's the size difference between the whites and the other frogs? Since whites get much bigger than your other species (and they do eat smaller frogs), I would worry that your other frogs will eventually become a meal if they're housed together.

When end you say you can get rid of the leopard frogs, do you mean rehome them or release them? Even though the frogs are originally wild caught it isn't a good practice to release them after keeping them in captivity. They could have been exposed to pathogens or parasites while they were with your other frogs that they will then introduce to the native frog population if released.