Is the mold harmful to frogs? I have recently made a vivarium and once i got it fully set up, i got white mold on some of my leaf litter at the bottom. I heard it will go away and is not harmful to my frogs. I have varaderos though so it might be a different case since you have tree frogs. I dropped some springtails in the bottom of my tank to help with it. It is unsightly but i was under the impression that it wont hurt the frogs.